I recently received an email from cadenzainteractive.com inquiring about a distribution method for steam keys for their then-upcoming giveaway. At the time, all I had was a key-captcha webpage here that utilized captchas to prevent key farming by bots.
After investigating what existed, I found python script – code here – that had successfully distributed 50,000 keys. This script required you had python and additional imports installed.
Getting back to cadenzainteractive, using my tool, they successfully delivered 4,000 steam keys on reddit: http://redd.it/ve7dj.
Try it here
Notes: The program uses the reddit API to reply back to unread messages from reddit users requesting a key.