I've just uploaded a beta version of fTelnet packaged with HtmlTerm and WBA (Web BBS Assistant). This archive includes examples for running either fTelnet or HtmlTerm in stand-alone mode, or for running them in fallback mode (so if the users browser doesn't support the preferred client, it'll try the other client too). It also includes WBA, which implements both a Socket Policy server (for fTelnet) and a WebSocket to Telnet redirector (for HtmlTerm).
If you're feeling brave and would like to give it a try, here's Beta 1. Please let me know if you run into problems with any of the 3 pieces of software, being beta quality I didn't put as much testing in as I normally would for a release version.