Ongoing maintenance and development of this library is in the Session Technology Foundation fork. For more details, see announcements from Session and the OPTF regarding handing over the stewardship of the Session Project to the Session Technology Foundation, a Swiss-based foundation dedicated to advancing digital rights and innovation.
C Library: https://api.oxen.io/libsession-util-c/#/
C++ Library: https://api.oxen.io/libsession-util-cpp/#/