Twilio provides telephony, SMS and voice APIs priced per message and per minute. Open telephony stacks and SIP platforms let you build call handling, PBX features and messaging on your own servers without per-message fees from one carrier-reseller.
6 open-source alternatives to Twilio you can host yourself, ranked by GitHub stars and updated daily.
| # | App | Category | Stars | Language | Updated |
|---|---|---|---|---|---|
| 1 |
signalwire/freeswitch
|
VoIP & Telephony | 5,299 | C | 2d |
| 2 |
asterisk/asterisk
|
VoIP & Telephony | 3,680 | C | 6d |
| 3 |
typpo/textbelt
|
Push Notifications | 3,392 | JavaScript | 2y |
| 4 |
fonoster/routr
|
VoIP & Telephony | 1,734 | TypeScript | today |
| 5 |
2600hz/kazoo
|
VoIP & Telephony | 990 | Erlang | 1y |
| 6 |
rtckit/eqivo
|
VoIP & Telephony | 90 | PHP | 11mo |