Does the rift work with anything other than Unity or UE4?

Hello! I am new to the VR and I am trying to venture and create a little project. I was wondering, do I really need to use UE4 or Unity? Or if I have a .exe file that holds a simple triangle can be displayed in the Rift? if not, is there any way on doing this? has anyone attempted it?  I hope your prompt response guys! Thank you before hand.