I do a lot of open source node.js work like building bots or simple data processing at a high scale.
An open-source and free twitter implementation with focus on easy high-scalability.
A Twitch chat/IRC moderation bot. It will help chat moderators with auto-kicking spambots and texting phrases.
A scaleable image uploader, try it: sharepic.moe.
50-line plain-text PasteBin clone.