Question: I'm looking for a way to make voice calls within a group chat, do you know of any apps that offer this feature?

For group chat voice calls, GroupMe is a good choice. It lets you make group and one-on-one calls within its chat app, with a maximum of 10,000 members without ever having to share your phone number. It also offers topic chats, Copilot AI, SMS-only mode and mod controls for group administrators, so it's good for a variety of group communication needs.

Another good option is ZEGOCLOUD, which offers APIs and SDKs to add real-time voice, video and chat abilities to mobile and web apps. The service spans many industries and offers video conferencing, voice chat, in-app chat with rich media and offline messaging. It's designed to scale to high traffic and has low latency, making it a good choice for group chat.

If you're more of a developer, QuickBlox offers APIs and SDKs to add chat and calling abilities to Android, iOS and web apps. It offers voice and video calling, video conferencing and secure file transfer, with a big push on security compliance. It's widely used by developers for everything from health care to finance.

Last is Tencent RTC, another powerful option that lets developers add voice, video and conference abilities to web and mobile apps. It offers UIKits, live streaming and chat APIs, with high availability and stability. It works on multiple platforms and is tuned for networks around the world, so it's a good choice for group voice calls.