Cryoserver - Cryoserver is an all-in-one email archiving solution that empowers you to preserve your email in a tamper-evident archive, making you transform your data into a useful archive for everyday use.
Xmind - Xmind is a brainstorming and mind mapping application.
imapsync - Console-based utility for migrating IMAP mailboxes.
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Gmvault - Backup the emails in your Gmail account.
Coggle - Coggle is a simple, beautiful, powerful way of structuring information.