WRT54G was my first box and it worked so flawlessly as a router. Port forwarding and DynamicDNS had never been so easy. I just wish there were dd-wrt compatible

WRT54G was my first box and it worked so flawlessly as a router. Port forwarding and DynamicDNS had never been so easy. I just wish there were dd-wrt compatible modems+router combos out there. How are there no open source DOCSIS 3.0 compatible modems out there?