Please take a look at the Vault 3 personal information manager (PIM). It runs on 32 and 64 bit Linux (GTK) (32 and 64-bit Windows too). Vault 3 is open source.
Vault 3 main page:
Vault 3 Screen Shots are here:
Download Vault 3 software and source code here:
Browse Vault 3 source code here: