Communication
Mixero Desktop
Mixero Desktop combines Facebook and Twitter for easy social networking.
Confide
Confide app: high encryption, self-destructing messages, hover-to-view feature.
TheDesk
TheDesk: Mac client for Mastodon, customizable interface, multiple accounts.
ProjectForum
ProjectForum: easy online communication tool for work groups, free version available.
Tutal Mail
Tutal Mail: secure, private email app with advanced features, sustainability.
Postbox
Postbox email client with advanced search, tabs, and web services.
Eudora
Eudora: user-friendly email client with multiple features for managing accounts.