Quick Fix Engine
QuickFIX/C++ implements the FIX Protocol on .NET.
QuickFIX/C++ is 100% free and open source with a liberal license.
QuickFIX/C++ is a FIX 4.0 – 5.0 Protocol implementation for C++, Python and Ruby.
Thanks to Oren Miller, the creator of QuickFIX and the original C++ version.
Also thanks to Jim Downs, CEO of Connamara Systems for supporting the open-source initiative for QuickFIX.