Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
Clyp - Clyp is the easiest way to record, upload and share audio. No account required.
Membee - Membee is web-based membership management software.
Audio Hijack - Record any audio, with Audio Hijack!
Galette - Galette is a membership management web application towards non profit organizations.
Loopback by RogueAmoeba - Get all the power of a high-end studio mixing board, right inside your Mac!