Top Alternatives to MicroSIP

Jitsi is a free and open-source suite of secure, flexible communication tools. It offers multi-platform support for voice (VoIP), video conferencing, and instant messaging, emphasizing privacy and ease of use with no account required to start a meeting.

Wire is a secure, cross-platform messaging and collaboration client offering end-to-end encryption by default for all communication types including messaging, voice and video calls, and file sharing across desktop and mobile devices.

CSipSimple is a powerful and highly configurable open-source VoIP application for Android devices, enabling high-quality voice and video calls, messaging, and integration with various SIP providers. It prioritizes security and offers advanced features for both individual users and businesses.

Zoiper is a versatile and easy-to-use SIP softphone designed for clear voice and video communications. It offers excellent audio quality, robust security features, and seamless integration with various communication protocols, making it ideal for personal and business use.

Telephone is a user-friendly SIP softphone application for macOS that enables encrypted voice calls over the internet or a private network. It supports various codecs and offers features like call recording, address book integration, and secure communication.

Phoner and PhonerLite are a pair of free softphone applications designed for Windows operating systems. They enable users to make Voice over IP (VoIP) calls and securely communicate using the Session Initiation Protocol (SIP), with support for end-to-end encryption.

YakYak is an unofficial desktop client for Google Hangouts, providing a dedicated application experience outside of a web browser with features focused on convenience and improved usability.