Linux

Paint on an infinite canvas with Milton, a free and open-source drawing program.

BusyBox for Windows provides many common Unix tools in a single binary, according to the supplied project page.

Aconvert offers online conversion for document, ebook, image, icon, video, audio, and archive files.

Recordly creates demo videos and is listed as a screen recorder for macOS, Windows, and Linux in its repository topics.

TavernAI supports roleplay chats with characters, branching scenes, and prompt controls.

Use Rolisteam as a virtual table for tabletop role-playing game sessions.

Big List of Randomizers catalogs known game randomizers and accepts community suggestions for additional titles.

Gamepadla catalogs gamepad input-latency tests and lets visitors compare button and stick measurements across controllers.

Lutris installs and launches games on Linux and describes itself as an open-source game preservation platform.

Polychromatic manages RGB lighting peripherals on GNU/Linux through a front-end that supports OpenRazer.

FreeRDP provides a client implementation of the Remote Desktop Protocol.

tldr provides collaborative example-based help pages for console commands.

Create and run a self-hosted VPN server on your own cloud or dedicated server with Amnezia.

Sentinel configures macOS Gatekeeper, removes quarantine attributes, and self-signs apps; its project is on hold.

Broot navigates directory trees, finds files, and launches commands from a terminal.

Browse, search, upload, and discuss wallpapers in the wallhaven.cc community collection.

Tenacity provides cross-platform multitrack audio recording and editing, with audio import, export, and plugin support in an open source project.

CaribouLite adds a 6 GHz transmit and receive software-defined radio platform to Raspberry Pi boards.

RimSort manages mods for RimWorld through a free open source app available across multiple platforms.

Discover hosts and map networks with Nmap, a network exploration and security scanning tool.

DOS Haven lists 264 modern and new games made for DOS computer systems.

Browser Tamer is a local browser proxy for Windows and Linux with browser autodetection, rules, and scripting.

Terminals Are Sexy is a curated list of terminal frameworks, extensions, and resources for command-line users.

SEO Content Machine connects a website and Search Console to plan new pages and improve existing SEO content.