Boosted trees in Julia
Orange: Interactive data analysis
XML/HTML handling tools for primates
Minimal and efficient cross-platform file watching library
JavaScript diagramming library for interactive flowcharts & org charts
Parallel file processing made easy
Julia chess programming library
Syntax Tree Drawing Software (Linguistics)
a very lightweight advanced terrain-rendering and 3D map rendering sys
Efficient and customizable TreeLayout Algorithm in Java, for NetBeans
a dbms for neural nets. Chatbots, DTrees, random forests, n-grams,...
Flare is an ActionScript library for creating visualizations
Fast customizable time series web database for big data like log files