- Mozilla [NPL/MPL/LGPL/GPL]
- Mozilla SeaMonkey [MPL, NPL]
- Sylpheed-Claws
- MicroPlanet Gravity [BSD]
- Eudora [???]
- Athea
- Mahogany
- Polarbar Mailer
- Magic Mail Monitor 3 [GNU GPL]
- Phoenix Mail
- MailReactor [GNU LGPL]
- RoundAbout [GNU GPL]
- AmphetaDesk
- KookieJar (signature generator)
- POPFile
- Outclass [GNU GPL]
- mutt [GNU GPL]
- Unixmail [GNU GPL]
- XanaNews [MPL]
- Pan [GNU GPL]
- Mozilla Thunderbird
- PopTray [GNU GPL]
- Blat [Public Domain]
- slrn [GNU GPL]
- FeedReader [GNU GPL]
- RSSOwl [Common Public License]
- Evolution [???]
- si.Mail [GNU GPL]
Accessing HTTPMail services like Hotmail, Yahoo,... (I need testers for this software, please mail me your experiences!)
- YahooPOPs! [GNU GPL]
- HotPOP3 [GNU GPL]
- FreePOPs [GNU GPL]
- MrPostman [GNU GPL] (Note: has been reported not to work with the current HotMail system...)
- jHTTPMail [GNU LGPL] (how to use this??? is it a library ???)
- HTTPMail [GNU LGPL] (how to use this??? is it a library???)
- Blue HTTPMail [zlib/libpng License] (How to use this???)
Anti-Spam
- Mailfilter [GNU GPL]
- Spamihilator [GNU GPL]
- SpamBayes [Python Software Foundation]
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