This little mod rewrites one function of the advancements logic to make advancements checking faster, and use less recursion. It should prevent StackOverflowErrors with advancements.
This mod adds a little more believability to your first few minutes of play, via the titular feature: Blocks don't drop anything if broken without the correct tool.
A Google Maps-like map for your Minecraft server that can be viewed in a browser. Easy to set up when making use of Dynmap's integrated webserver, while also supporting advanced deployment with Apache and other web servers.