Sendy

Alternative private mail system - web-based, end-to-end encrypted by design, self-hosted, decentralized, uses independent PKI. Easy to install and administrate, freeware, open-source.

Full-featured PABX system, with call queues, built-in web conferencing, live chat and social media messaging all on one system.

Email forwarding service for creating aliases.

Powerful plugin that takes your WordPress.org powered site beyond the blog with social-network features like user profiles, activity streams, user groups, and more.

Customer communication platform (alternative to Intercom & Zendesk).

Feed reader for your email accounts.