Free UTM appliance: firewall, VPN, WAF and antivirus in one ISO.
...A fully custom network appliance operatingsystem built from scratch over 20 years, now fully open source.
One ISO includes: firewall, VPN, web antivirus, URL filtering, SSL inspection, WAF, reverse proxy, load balancer and QoS.
Free for any number of users. Optional paid support available.
Sourcecode: https://github.com/cacheguard/CacheGuard-OS
Website: https://www.cacheguard.com/
OpenVoucher is an open source voucher management / hotspot system for authenticating guests in your wifi or cable network. It is designed to be easy to use for anyone who wants to issue vouchers.
For further information and installation how to's, see the project's homepage.
The source code is maintained on Github.