Alpha, another user here, just told me about Syncterm as a web service. Might be worth a look, although its not a native app:
https://github.com/jaromaz/stws
| Sysop: | Chris Crash |
|---|---|
| Location: | Huntington Beach, CA. |
| Users: | 626 |
| Nodes: | 8 (0 / 8) |
| Uptime: | 153:05:15 |
| Calls: | 10,914 |
| Files: | 5 |
| Messages: | 567,659 |