Magic Music Visuals - Fully-customizable and highly responsive visuals for live and recorded audio & MIDI.
Clio - Clio provides a full suite of web-based practice management tools targeted specifically at the administrative needs of sole practitioners and small firms.
MilkDrop - 3D audio visualization plugin, compatible with WinAmp plugin API
MyCase - Practice More, Manage Less.
projectM - projectM is an LGPL'ed reimplementation of Milkdrop under OpenGL.
PracticePanther - PracticePanther offers CRM, invoicing, time tracking and communication solutions for law firms.