JVoiceXML
6.2#10 in ivr softwareFree planFree planAPILinuxSelf-hosted
VisitJVoiceXML may suit Java developers building VoiceXML speech dialogs who want an open-source interpreter and custom extension options. Its listed platforms include API, Linux, and self-hosted use.
Voicent suits organizations that need automated voice, email or text outreach with call-center tools. Its browser-hosted service is an option for teams accessing it from different devices; on-premise users need Windows.