The Humble Weekly Bundle is for Mastertronic titles.
Pay what you want ($1 min for Steam keys) for:
Blast Em! + Source Code
May’s Mysteries: The Secret of Dragonville
Richard & Alice
Speedball 2 HD
The Chaos Engine
Beat the average (currently $3.58) for above plus:
10 Second Ninja
Over 9000 Zombies!
Pay $15 minimum for above plus:
All titles activate on Steam.