I recently built an rssCloud Server implementation in node.js
It's open source, MIT licensed and available on GitHub. I have a copy of it running live at rpc.rsscloud.io:5337. I'm hoping to get folks to poke it and help me make it more stable.
Since it's hard to test an rssCloud server without data flowing through it I also built a Hacker News Firehose Feed which is populated live using the Hacker News API. It's also open source, MIT licensed and available on GitHub.
Please submit issues on GitHub and I'm open to pull requests.