RTG

Hello, We've been using this product for years and years http://rtg.sourceforge.net/ to collect and store SNMP statistics. It has been working fine for us. I haven't really been able to find much information about forks, new versions, and development happening on it. A while back I heard that Yahoo created their own version of it but I could never find it. Does anyone know if there is a spiritual successor to RTG that pretty much works the same way that is modernized? Thanks! -Drew