Client

ArgentumInvoice: Free, Open Source, Online Project Management & Invoicing Software

http://www.argentuminvoice.com/ open source client-management and invoicing software

[freeware ipsec vpn client for windows] Shrew Soft Inc : Download

http://www.shrew.net/download An alternative to CiscoVPN Client, which is, sadly, is known not to work on 64bit versions of windows xp/vista/7.

Home :: Xuheki Webmail

http://www.xuheki.com/ new ajax imap webmail client

General Skype Analysis

http://www1.cs.columbia.edu/~salman/skype/index.html Info about Skype internals