Ask HN: What open-source projects would benefit from GPU?

I've been using GPU's to do financial computations . I then started to look at where I had slowness and it was from the database. This got me thinking of contributing to PostgreSQL the ability to execute on the GPU if appropriate for the users system.

But would they want this?

What open-source projects are appropriate for adding using GPU's to do execution?

edit: I'm a C/C++ developer (well for the last 25 years..)