For context, here are some similar services:
| Service | FLOSS client | Notes |
| Burner | No | Focused on being a "second number" for your phone. |
| Line2 | No | |
| Hushed | No | |
| Google Voice | No | |
| CoverMe | No | (it's not..super clear if this is a chat protocol with some sort of weird SMS glue or if it's a genuine bridge) |
| Sideline | No | |
| TextNow | No | |
| MySudo | No | |
| VoIP.ms | Yes (CSipSimple/Voip.ms SMS) | |
| Vitelity | Yes (SIP/XMPP) |