* [FreeRADIUS](http://www.freeradius.org) - high performance and highly configurable multi-protocol policy/authentication server, supporting RADIUS, DHCPv4 and VMPS ([Source Code](https://github.com/FreeRADIUS/freeradius-server)) `GPLv2``C`
* [daloRADIUS](http://www.daloradius.com) - open-source web management platform for FreeRADIUS-based deployments ([Source Code](https://github.com/lirantal/daloradius)) `GPLv2`
* [IndieAuth](https://indieauth.com) - Sign in with your domain name (using the [rel-me-auth](http://microformats.org/wiki/relmeauth) protocol) `Apache``Ruby`
* [Libravatar](https://www.libravatar.org/) - a service which delivers your avatar (profile picture) to other websites
* [OSIAM](https://www.osiam.org) - Open Source Identity and Access Management implementing OAuth 2.0 and SCIMv2. ([Source code](https://github.com/osiam/osiam)) `MIT``Java`
* [FreeRADIUS](http://www.freeradius.org) - open-source RADIUS server for AAA `GPLv2``BSD`
* [daloRADIUS](http://www.daloradius.com) - open-source web management platform for FreeRADIUS-based deployments [daloRADIUS on Github](https://github.com/lirantal/daloradius) `GPLv2`