Cross-platform free software

CGI:IRC is a CGI program written in Perl that allows access to IRC via a web browser. It is designed to be flexible and has many uses such as an IRC gateway for an IRC network, a chat-room for a website or to access IRC when stuck behind a restrictive firewall.

animated cursor-chasing cat screenmate application

free and open-source Shadowsocks deployment tool

PlayCanvas is an open-source 3D game engine/interactive 3D application engine alongside a proprietary cloud-hosted creation platform that allows for simultaneous editing from multiple computers via a browser-based interface. It runs in modern browsers that support WebGL, including Mozilla Firefox and Google Chrome. The engine is capable of rigid-body physics simulation, handling three-dimensional audio and 3D animations.

Virtual eurorack digital audio workstation

subtitle editing software

QtWeb is a discontinued free and open-source web browser developed by LogicWare & LSoft Technologies. QtWeb used the WebKit browser engine that was embedded in the Qt framework.

LazPaint is a free and open-source cross-platform lightweight image editor with raster and vectorial layers created with Lazarus. The software aims at being simpler than GIMP, is an alternative to Paint.NET and is also similar to Paintbrush.

software for presenting, online training, web conferencing, etc.