Here are some open source projects:

Software:

pwng (password-next-gen) - A configurable password generator and rating tool.

qc (quick-clipboard) - A lightweight CLI tool to copy file content to your clipboard

kpt (key-press-timer) - A lightweight utility to time how long a key has been held down.

mtc (minimal-tor-chat) - A minimalistic web-based chat server. Pre-configured for usage through the Tor network.

Libraries:

Java

nwju (nwawsoft-java-util) - A library containing data structures and functions that should be in the JDK, but are not.

Haxe

fen (haxe-fen) - FEN record implementation for chess.

Tutorials:

Building Node.js from source on the original Raspberry Pi (RP1)