HubSpot - Grow Better With HubSpot: Software that's powerful, not overpowering. Seamlessly connect your data, teams, and customers on one CRM platform that grows with your business.
Magic Music Visuals - Fully-customizable and highly responsive visuals for live and recorded audio & MIDI.
ActiveCampaign - Integrated email marketing, marketing automation, and small business CRM. Send beautiful newsletters, setup behavioral based automations, and benefit from sales automation.
MilkDrop - 3D audio visualization plugin, compatible with WinAmp plugin API
Pardot - Salesforce B2B marketing automation
projectM - projectM is an LGPL'ed reimplementation of Milkdrop under OpenGL.