RSS->IMAP server is a basic IMAP server implementation that allows you to browse your RSS feeds like emails. This is perfect for adding basic RSS functionality to older email clients that do not have RSS readers built in such as Outlook 2003.
JFetch is an application to download your email through protocols like POP3 and IMAP. The decision of whether to download a mail or not is made through a sequence of filters. The user can easily add customized filters to this sequence.
Kommunicator could organize your communication in a smart way. Due the easy use of plugins you will be able to integrate different communications form like SMS, Mail, IM in a most personalized way, but the programm will stay easy and lightweighted.