Not open source or free but I find PragmataPro [0] to be absolutely gorgeous. Iosevka comes close but I don't think it'll ever be able to bridge the gap for me.
Honestly I've never thought to buy a font unless I was using it for web or print... but I may have to buy that just for myself.
Great fonts bring me a lot of joy, but Pragmata Pro always felt fairly ridiculously priced to me. I know the author put a lot of time into it, but 99% of the font's features are irrelevant to me (I'll never use Hebrew, for instance, or even the non-mono version of the font).