pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more
OSRM - Utilities, Application Utilities, and Mapping APIs
OPNsense - OPNsense® you next open source firewall. Free Download. High-end Security Made Easy™. Offers Intrusion Prevention, Captive Portal, Traffic Shaping and more.
FRRouting - FRRouting (FRR) is an IP routing protocol suite for Linux and Unix platforms which
Emsisoft Online Armor Firewall - Emsisoft Online Armor Firewall is a freemium online firewall protection system by the Emsisoft that is based on the own independent protection technology of the Emsisoft.
OpenRouteService.org - The spatial services API with plenty of features.