GameNetworkingSockets
6.5#16 in game networking middlewareFree planFree planiOSAPILinuxmacOS
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It suits developers building game networking who need UDP messaging, peer-to-peer options, or traffic diagnostics. Its C++ core and C interface may fit projects using the listed language bindings.
Normcore suits Unity developers building multiplayer games, social or collaborative experiences, and applications for VR, AR, or WebGL. Private deployment options may also suit organizations that need on-premises or dedicated-server hosting.