Proxmox Mail Gateway - Protect mail server against spam, viruses and malware with Proxmox Mail Gateway security for businesses, government, education and non-profit organizations.
LibreOffice - Free office suite, open source, and compatible with .doc, .docx, .xls, .xlsx, .ppt, .pptx files. Updated regularly – download for free. Originally based on OpenOffice.org.
SpamAssassin - Use this program to "Unspam" your mailbox(es).
Microsoft 365 - Boost your productivity with reliable access anywhere with services like email, calendar, file sharing, meetings, instant messaging, and Office Online
Rspamd - Rspamd is an advanced spam filtering system that allows evaluation of messages by a number of rules...
ONLYOFFICE - ONLYOFFICE is a complete office and productivity suite.