Prohunter - an android client for Product Hunt
Undrtone - Social layer on top of Spotify and Rdio from Scott Vener
SCARM - Simple Computer Aided Railway Modeller
Symphona App - Designed to make orchestral staff management a breeze.
TRAX - Trax is a free web-based tool for planning your model railroad
JamBuddy - Find and collaborate with musicians around you thru Spotify