Working on keycontain.com - I'm trying to use agents to automate various tedious things I'm responsible for, and all the API keys that services give out are way too permissive. KeyContain lets you restrict calls to those API keys down to individual arguments, and lets you declare some requests to require approval.

I'm now using it to safely join together services like dns management, app deployment, accounting and grant-writing, etc. I may be biased, but I think it's great!