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JSONing

JSONing is a developer tool that provides a mock API for testing and prototyping. It can generate a custom API from a JSON object, define resources such as products and users, and apply JSON-based rules to customize HTTP status codes, headers, and response bodies.

JSONPlaceholder is a free fake REST API for testing and prototyping. It serves common resources such as posts, comments, albums, photos, todos, and users over standard HTTP endpoints, and supports GET, POST, PUT, PATCH, and DELETE requests.

JustBlogged is a hosted blogging platform that lets users create and publish a blog from a web interface in about 2 minutes. The service includes blog hosting, custom domains with free SSL, default themes, built-in SEO metadata, and an API for publishing and integrations.

KanbanFlow

KanbanFlow is a lean project management platform designed to help individuals and teams organize work visually and improve delivery flow. It combines a Kanban board with time tracking, reporting, and collaboration features in a single workspace.

Lazarus is a Delphi-compatible cross-platform RAD IDE for Free Pascal. It includes a graphical form designer, component library, and tools for building desktop and other applications from Pascal source code.

Let’s Encrypt is a certificate authority that issues free Domain Validation (DV) TLS certificates for websites and other domain-based services. It uses the ACME protocol and automated clients to let operators obtain, renew, and manage certificates without manual issuance.

LocalCert

LocalCert provides free .localcert.net subdomains for private networks that need certificates from public certificate authorities such as Let’s Encrypt. The service is used to avoid running a private certificate authority while still issuing publicly trusted TLS certificates for internal hosts.

localhost.direct is a developer utility that provides a localhost domain with HTTPS support and wildcard subdomain handling. It lets local development work run natively on localhost.direct without extra configuration, with the exception of the reserved get.localhost.direct subdomain.

localhost.run

localhost.run is an SSH-based tunneling service that exposes a local web application to the internet through a remote tunnel endpoint. A developer can connect by running an SSH reverse tunnel command ...

MailCatcher

MailCatcher is a local SMTP server that captures messages sent to it and displays them in a web interface. Developers point applications at smtp://127.0.0.1:1025, then review received mail at http://127.0.0.1:1080/.

Metalama is an open-source patterns and architecture toolkit for C# built on Roslyn. It lets developers define aspects and project fabrics in C# so the compiler can generate repetitive code at build time and report architecture violations in the IDE as code is written.

micro-jaymock

micro-jaymock is a tiny API mocking microservice that accepts a JSON template in a POST request and returns generated fake JSON data. It supports template fields such as names, addresses, finance values, repeated objects, and other fake-data generators exposed through jaymock.

Microsoft Clarity

Microsoft Clarity is a web analytics product that records user sessions and generates heatmaps for websites and apps. It also includes AI summaries, AI chat, AI visibility, and brand agent features for analyzing behavior and surfacing insights from site traffic.

MySQL Visual Explain

MySQL Visual Explain is a web tool that converts MySQL EXPLAIN output into a visual query plan. It accepts a SQL query and shows the execution structure in a simpler format than the raw EXPLAIN text, with example plans for joins, subqueries, and complex queries.

Namae is a name availability checker for new app, library, and organization projects. It queries multiple registries at once so a developer can compare candidate names across domains, package registries, social platforms, app stores, and hosting services from a single search.

NewReleases.io

NewReleases.io is a release tracking service for software developers and DevOps teams. It monitors supported source code and package registries such as GitHub, GitLab, Codeberg, Gitea, Bitbucket, PyPI...

nip.io / sslip.io

nip.io and sslip.io are DNS services that resolve hostnames containing embedded IP addresses back to those IP addresses. They support dotted, dashed, subdomain, hexadecimal, and IPv6 hostname formats, and can be queried directly with standard DNS tools such as dig.

noip.at DynDNS

noip.at DynDNS is a dynamic DNS service that updates hostnames to point to changing IP addresses. The landing page describes it as a free service with no tracking, no logging, and no advertising, and links to the source code on GitHub.

Nominatim is an open-source geocoding service that uses OpenStreetMap data to find locations by name and address, and to perform reverse geocoding from latitude and longitude to the nearest address or OSM object.

OMAR

OMAR is a terminal user interface for orchestrating hierarchies of AI agents from a single tmux session. It runs on macOS and Linux, supports multiple agent backends including Claude Code, Codex CLI, ...

OpenAPI Definition Designer

OpenAPI Definition Designer is a web-based editor for creating OpenAPI 3 definitions. It supports adding schemas, paths, operations, parameters, request bodies, responses, and API security definitions, with JSON and YAML views for editing and saving definitions.

OpenReplay

OpenReplay is a self-hosted session replay and product analytics platform. It records user interactions in web and mobile applications so developers can replay sessions, inspect console errors, network activity, performance metrics, funnels, heatmaps, and journey analysis from the same product.

openSUSE Build Service

openSUSE Build Service is a public instance of the Open Build Service used to build packages from the same source for openSUSE and other Linux distributions, including Fedora, Debian, Ubuntu, and SUSE Linux Enterprise.

Pastefy

Pastefy is a web-based pastebin for sharing code snippets and text pastes. Users can create a paste, share it publicly, organize pastes into folders, and use client-side encryption for secret snippets.

Photopea

Photopea is a browser-based image editor that runs locally on the user’s device. The page states that files are not uploaded, that the editor uses the device CPU and GPU, and that it can be used offline after loading the site.

Pipedream Request Bin

Pipedream Request Bin provides a public URL for collecting HTTP requests and webhook payloads, then inspecting the incoming headers, body, and other request details in a human-friendly interface.

Piruetas

Piruetas is a private journal web application for writing one entry per day, with support for images and basic text formatting. It stores entries privately by default and includes export and share-link features for individual days.

Pixela

Pixela is a REST API service for recording and tracking habits, effort, and other day-series activity data. Users create an account, define a graph, and post dated values through HTTP requests; the service then renders the data as a GitHub-like graph or badge.

point.poker

point.poker is a browser-based Planning Poker tool for distributed teams to estimate work using Scrum Poker, Pointing Poker, or Point Poker sessions. Users can create a session and join from desktop, tablet, or smartphone without registration.

pollinations.ai

pollinations.ai provides APIs for generating images, text, audio, and video from AI models. The service is accessed through developer-facing endpoints and documentation, with community support and a web play area for trying the product.

QRtracer

QRtracer is a QR code generator that creates high-resolution PNG QR codes from a pasted URL or other data. The service supports custom colors, logo overlays, and scan tracking through a free account, with analytics for counts, locations, devices, and time-of-day breakdowns.

Quant-UX is a web-based research, usability testing, and prototyping tool. It provides a visual editor for creating interactive prototypes, then lets users share a link to collect user feedback, run tests, and review analytics in the same product.

quicktype

quicktype is a code generation tool that converts JSON, JSON Schema, sample API responses, URLs, and GraphQL queries into strongly typed models and serializers for multiple programming languages.

Radmin VPN

Radmin VPN is a Windows software product that creates virtual local networks so remote computers can appear on the same LAN. It uses an encrypted tunnel to connect computers behind firewalls and supports Windows 11, 10, 8, and 7.

rawgit.hack

rawgit.hack is a CDN and caching proxy for source code hosting services. It fetches raw files from repositories on GitHub, Bitbucket, GitLab, Gitea, and Codeberg, then serves them with correct Content-Type headers for browser use.

reSmush.it

reSmush.it is a WordPress image compression plugin and HTTP API that compresses JPEG, PNG, GIF, TIF, and BMP files in the cloud. It supports image submission through the WordPress plugin, direct API c...

RocketGit is a free, privacy-focused Git hosting service for public and private repositories. It is offered as free software under AGPLv3+, with an emphasis on avoiding vendor lock-in, respecting contributor privacy, and supporting both hosted and on-premise use.

RustDesk

RustDesk is an open-source remote desktop and remote support application that connects clients through RustDesk relay and rendezvous servers. It supports self-hosted deployment with Docker Compose, and the server can be run from the provided OSS or Pro compose files.

Savannah

Savannah is a free software hosting forge for GNU and non-GNU projects. It provides project registration and hosting for source code, issue tracking, support requests, tasks, patches, mailing lists, and project statistics.

ScreenSharing

ScreenSharing is a browser-based screen sharing service that lets a user start a session from the web, choose a screen or application window, and share a generated link with viewers. The page describe...

Semaphr

Semaphr is a mobile app management platform for iOS, Android, and React Native apps. It lets developers block specific app versions, force updates, and send in-app messages when a release needs to be stopped or users need to be notified.

SEO Test

SEO Test is a web-based on-page SEO checker that accepts a URL and returns a free SEO test result. The landing page indicates a simple input-and-analyze workflow rather than a multi-step audit suite.

ServerAvatar

ServerAvatar is a cloud server management panel for PHP, WordPress, Laravel, Node.js, and related web applications. It connects to existing VPS or cloud instances and provides a web dashboard for serv...

Shields.io

Shields.io is a badge generation service that provides dynamic and static badges for software projects. It renders badge images from service metrics and custom text, and also offers an NPM library for generating badges inside applications.

Skypack

Skypack is a CDN for optimized npm packages that serves JavaScript modules directly from URLs such as https://cdn.skypack.dev/package-name. It preoptimizes packages for browser use and supports packag...

SMSGate

SMSGate is an open-source SMS gateway for Android devices that exposes a REST API, client libraries, and a CLI for sending and receiving SMS messages through a connected phone. It supports Android 5.0...

SQLable

SQLable is a website that provides developer tools and posts related to SQL and databases. The site includes utilities for formatting SQL, validating queries, working with regular expressions, generating data, and comparing or transforming CSV files.

SSL Server Test is a free online service from Qualys SSL Labs that performs a deep analysis of the configuration of a public SSL/TLS web server. Users submit a hostname and the service returns a report on certificate and protocol configuration.

maps.stamen.com is a web map tile viewer for Stamen map styles, including Toner, Terrain, and Watercolor. It presents interactive map previews and links to style variants such as labels, lines, background, lite, dark, and blacklite for Toner, plus standard, labels, lines, and background for Terrain.

Statically

Statically is a free global CDN for Git repositories and npm packages. It serves optimized files from GitHub, GitLab, Bitbucket, GitHub Gist, and npm through fixed CDN URL patterns, allowing developers to reference repository assets directly from a global edge network.

Statuspile

Statuspile is an open-source status dashboard for tracking the status pages of multiple service providers in one place. It provides a web dashboard where users can add and remove providers, save their configuration through Auth0 login, and fork the code from GitHub.

Sucuri SiteCheck

Sucuri SiteCheck is a remote website security scanner that checks a URL from the browser side for known malware, viruses, blacklisting status, website errors, out-of-date software, malicious code, red...

SunriseSunset.io

SunriseSunset.io provides a keyless JSON API for sunrise, sunset, twilight, golden hour, blue hour, and moon data for any point on Earth. It accepts latitude and longitude on a single GET request and returns times, azimuth, altitude, moon phase, timezone, and related fields in JSON.

talky

Talky is a browser-based video chat and screen sharing service that creates a unique room URL for each call. Users enter a name or start a chat, then share the room link with up to 6 participants who join through a supported browser without creating personal accounts.

Temp Mail

Temp Mail is a disposable email service that generates temporary inboxes for receiving messages without exposing a primary email address. The page describes a browser-based inbox with actions to copy,...

Tenzu

Tenzu is a web-based task and project management tool that uses Kanban boards, workspaces, and collaborative editing to organize work. It includes real-time co-authoring on task content, attachments, comments, a REST API, and support for multiple languages.

Test TLS

Test TLS is a free online scanner for TLS configuration of servers. It checks a domain name or IP address on a specified TCP port and reports TLS configuration settings, security vulnerabilities, and the server's X.509 certificate.

The Odin Project

The Odin Project is a free, open source full stack web development curriculum. It organizes curated tutorials, blogs, and courses into a structured learning path covering HTML and CSS, JavaScript, databases, React, NodeJS, Ruby, Ruby on Rails, and getting hired.

TimeCamp

TimeCamp is a time tracking and project profitability platform that records work through web, desktop, mobile, and browser apps. It supports manual time entry, timers, automatic tracking, timesheets, ...

ttl.sh

ttl.sh is an anonymous, ephemeral OCI registry for pushing and pulling container images and other OCI artifacts with a time-to-live tag. Users can push artifacts with no authentication, no account, and no configuration, then retrieve them until the TTL expires automatically.