Open-Source Websites & Tools

Apply post-processing effects to games and video software with ReShade.

Aleph One is the open source continuation of Bungie's Marathon 2 game engine for macOS, Windows, and Linux, supporting Marathon, Marathon 2 and Marathon Infinity natively.

SuperF4 lets Windows users close programs with the Ctrl+Alt+F4 shortcut, according to its project description.

Twine helps users follow web feeds through a multiplatform RSS reader built with Kotlin.

View and edit images across multiple operating systems with oculante, an image viewer and editor.

Restyle websites with CSS themes using Stylus, a browser extension listing compatibility with Chrome, Firefox, and Chromium-based browsers.

Terraink: The Cartographic Poster Engine that creates unique and customizable map posters

Twenty is an open-source customer relationship management (CRM) project described as an alternative to Salesforce and designed for AI.

NoPaste stores code in generated links without a database or backend service.

Floom orchestrates generative AI pipelines for developers and operations teams.

ITGmania brings a free open source dance game to multiple platforms with community-driven development.

Allow Right Click re-enables context menus, copying, pasting, and text selection on sites that block those actions, through a browser extension.

Manage multi-user proxy and VPN servers through the 3x-ui panel, which supports protocols including Vmess, Vless, Trojan, and WireGuard.

Compare files and folders visually with WinMerge, an open-source differencing and merging tool for Windows.

RollerCoaster Tycoon 2 receives an open source engine reimplementation through the OpenRCT2 project.

Mango Wave visualizes audio in the browser, with inspiration from Winamp and MilkDrop.

Use OpenTierBoy to create, rank and share tier lists with its free, open-source tool.

CrowdSec provides open-source intrusion prevention, web application firewall, and bot detection tools.

This Korean and English educational web app visualizes and explains a name-generation model inspired by microgpt.

Cerebro provides an open-source launcher for desktop productivity, according to its repository description.

LiftLog offers cross-platform tracking for gym lifts through a dedicated app.

Create and edit React page layouts with Puck, a modular visual editor for React.

ATLauncher integrates modpacks and supports installing and managing Minecraft game instances through its launcher.

Lychee checks URLs in Markdown, HTML, reStructuredText, websites, and other content for broken links and email addresses.