UPDATE: I found this issue explaining the relicensing of rust game engine Bevy to MIT + Apache 2.0 dual. Tldr: A lot of rust projects are MIT/Apache 2.0 so using those licenses is good for interoperability and upstreaming. MIT is known and trusted and had great success in projects like Godot.

ORIGINAL POST:

RedoxOS, uutils, zoxide, eza, ripgrep, fd, iced, orbtk,...

It really stands out considering that in FOSS software the GPL or at least the LGPL for toolkits is the most popular license

Most of the programs I listed are replacements for stuff we have in the Linux ecosystem, which are all licensed under the (L)GPL:

uutils, zoxide, eza, ripgrep, fd -> GNU coreutils (GPL)

iced, orbtk -> GTK, QT (LGPL)

RedoxOS -> Linux kernel, most desktop environments like GNOME, KDE etc. all licensed GPL as much as possible