FEX: A fast usermode x86 and x86-64 emulator for ARM64 Linux

This was posted recently with a large discussion:

https://news.ycombinator.com/item?id=45905850

FEX-emu – Run x86 applications on ARM64 Linux devices

300 points | 14 days ago | 137 comments

Incredible work here, super excellent job. Incredible job keeping performance high.

Valve/Steam have been funding Igalia to do some further work here on FEX, supporting Valve's Qualcomm Snapdragon 8 gen 3 powered Steam Frame headset. (Sharp move contracting brilliant talented open-source veterans, imo!) https://www.igalia.com/2025/11/helpingvalve.html

Amazing seeing a company care about software, take matters into their own hands in a real way. Such such such great wins for Steam.

Readme mentions "similar to qemu-user and box64" but don't talk about differences so not sure why this would be better to use than that