Unsee - The ability to open a chat session and message then delete it from history forever just like tlk.
Smartwaiver - Smartwaiver is an online waiver solution for business to manage signed waivers and customer data.
Chatango - Add free live chat to any web page. Chatango is a live group on your site
WaiverForever - Electronic waiver system for small businesses
Walkaround - Walkaround is a variant of Wave, based on the Apache Wave code base, that runs on App Engine.
WaiverSign - Cloud-based waiver and release of liability signing software