Ability to add rules on the fly in a declarative language makes pulsar from @ebaytechblog interesting - http://www.ebaytechblog.com/2015/02/23/announcing-pulsar-real-time-analytics-at-scale/#.VOxjmM17jUY

• People know Jenkins as a continuous integration server, but it can act as a great front end for your scripts and cron jobs.
• @amanmohla Tired go from @thoughtworks - http://www.go.cd/? I have no experience, but have heard people praising.

When evaluating open source projects, peek at the issues/tickets, gives an extremely good perspective of status quo.

CTE feature in @postgresql is neat - http://www.craigkerstiens.com/2013/11/18/best-postgres-feature-youre-not-using/