Guess it depends on definition of interesting and recently.
http://www.austinemerging100.com/list.php
HomeAway and BazaarVoice both just had IPOs. Indeed got bought for likely ~1 billion this year too. Phurnace exited to BMC for ~500 million about 2 years ago, Convio IPO that year. Spiceworks and WhaleShark seem like they are doing pretty well.
SocialWare, AppSumo, Uship, UnboundID, Outbox, Mass Relevance, Boundless, BlackLocus, WPEngine, CopperEgg, SailPoint, etc. I'm sure I'm missing tons, but point is there are lots.
