I have a great experience in OpenGL i have done these projects previously please, take a look
https://www.freelancer.com/projects/threed-animation/Ball-Pool-Game-using-OPENGL/
https://www.freelancer.com/projects/CPlusPlus-Programming/Write-some-Softwar/
https://www.freelancer.com/projects/CPlusPlus-Programming/Write-some-Software-10683526/
https://www.freelancer.com/projects/Software-Architecture/Upgrade-DirectX-solution-OpenGL-using/