3CX
Full-featured PABX system, with call queues, built-in web conferencing, live chat and social media messaging all on one system.
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Groupboard
Online whiteboard, audio/video conferencing, screen sharing, shared code editing and optional session recording/playback.
Chatwoot
Customer communication platform (alternative to Intercom & Zendesk).
Poste.io
Full-featured solution for your Email server. Native implementation of last anti-SPAM methods, webmail and easy administration included. Free tier available.
PrivMX WebMail
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.
Sendy
Self-hosted email newsletter application that lets you send bulk emails via Amazon Simple Email Service (SES) or other SMTP services.
TrueConf
Platform for your corporate communications, based on the advanced architecture, with support for UltraHD video conferencing, built-in messenger with personal and group chats, and a free version for up to 1,000 users.