Here are some handpicked open source projects I've worked on in the past. For a full list of things I've built on, see https://github.com/daboross.
An open source pastebin and short-link server. Mostly a learning project for python web servers, but also continuously runs at http://qx.lc. Built in Python with the flask web framework.
Simple, efficient logging for the
rust language. Lets users configure logging through branches/sub-loggers, up to an infinite depth. Each level can perform formatting, or filter through message priority or other arbitrary criteria.
A server-side Minecraft Minigame where players fight to the death on floating islands. It was built when I was much more part of the Minecraft community, and I've continued to partially maintain it since. It is my most used open source Bukkit plugin, with over 400,000 downloads to date.
mc-cli is a command line client for Minecraft. It uses an open source library for connecting to Minecraft servers and JLine for making a nice interface. It allows for 10+ fake clients to connect to the same running server, and is useful for testing plugin features which require many players to be online to function.
The source code for this website, and all interactive functionality.