Excited to announce that I finally managed to kick rate limits as a service out the door. A year or so in the making, but it's already been scratching my itch and solving my problems for a few months now.
I didn't intend to build feature flags in as well, but when I started coding I realized I can no longer code without them and it was just as easy to build them for everybody as it was to build them for just myself, so they're included too! (Feature flag documentation)
Two libraries so far: ratelimit-ruby and ratelimit-java. You'll never guess what they do!
Blogging about it at http://blog.ratelim.it/blog so head on over and subscribe to that to hear more. Oh and twittering at https://twitter.com/RateLimitInc
Happy rate-limiting to you!