Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.
pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more
Roundcube - Web-based IMAP email client
Zentyal - Linux directory, domain, mail, gateway and infrastructure server for SMBs.
ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.
NethServer - NethServer is an operating system for Linux enthusiasts, designed for small offices and medium...