Watercoolr

pubsub via webhooks, or "twitter" for your applications

Example:

Create a channel: 
→ POST /channels data={'type':'par'}
← { 'id':'2d0128d' }

Add subscribers: 
→ POST /sub data={ 'channel':'2d0128d', 'url':'http://api.other.com/msg-handler', 'type':'messagepub' }
← { 'status': 'OK' }

Post messages: 
you → POST /pub data={ 'channel':'2d0128d', 'message':'hey guys!' }
   us → POST http://api.other.com/msg-handler payload='hey guys!'
   ...for every subscriber...
← {"status":{"timeout":0,"fail":0,"ok":0}}

Sources: GitHub repository