You can install a cert (wildcard or non-wildcard) on any number of servers, haproxy instances, etc. There aren't any discounts for open source projects at the

You can install a cert (wildcard or non-wildcard) on any number of servers, haproxy instances, etc. There aren't any discounts for open source projects at the moment, but it's something I'll consider. GlobalSign does give away free certs to open source projects (https://www.globalsign.com/ssl/ssl-open-source/ https://www.globalsign.com/ssl/ssl-open-source/), though you wouldn't be able to use any of SSLMate's tools or automation with one of their certs.