Help with 3D accelerator

I have an old Compaq Presario 5030 (Intel Pentium II MMX, 64 MB, 300 MHz)
for which I would like to find an Open GL- compliant 3D accelerator, so that I
could use the PC as a gaming platform for my children. Can you please help me finding an appropriate 3D accelerator (low end price, if possible). Thank you very much for your help!