We've been using Polaris for the Loadbalancer.org GSLB for a few years now, and we've found it fast and stable. Its so simple its never needed any updates:
Although we did patch a dynamic health check a while back, which will be open source of course. But I'll get someone to check if we actually gave it back to the community or not...
https://www.loadbalancer.org/blog/gslb-why-global-server-loa...
Although we did patch a dynamic health check a while back, which will be open source of course. But I'll get someone to check if we actually gave it back to the community or not...