
Horde
Mailpile
Mailo
HEY
Cypht
Soverin
Teknik Mail
InstAddr
kdiff3
Beyond Compare
WinMerge
Meld
Araxis Merge
DiffMerge
P4Merge
Devart Code Compare
kdiff3Mailpile - Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features.
Beyond Compare - Beyond Compare allows you to compare files and folders.
Mailo - Mailo is an email client where you can send and receive emails to and from anyone with an email address.
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
HEY - Email at its best, new from Basecamp.
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.