Mini Micro is a new (free!) development environment for Mac, Windows, and Linux (also publishes to WebGL). Version 0.9 just came out last week, so to celebrate, we're hosting the Mini Micro v0.9 Game Jam, starting in 25 days... and giving away US$90 in prizes!
Since you're stuck inside anyway, why not take this opportunity to learn this cool neo-retro programming environment?