NethServer - NethServer is an operating system for Linux enthusiasts, designed for small offices and medium...
ngrok - ngrok enables secure introspectable tunnels to localhost webhook development tool and debugging tool.
ClearOS - A very good alternative for Windows Server, for free
Gotty - GoTTY is a simple command line tool that turns your CLI tools into web applications.
Univention Corporate Server - Univention Corporate Server UCS with Active Directory functions and App Center is the cost-efficient and popular successor to Microsoft's server solutions.
tmate - Tmate is a instant terminal sharing based on ssh.