The main site is more about stable releases, so they tend to have some time
between them.

Lots of the GUI toolkits are simply bindings to things like gtk or kde, so
they're beholden to that schedule.

Others, like Shoes, are under active development, but can be slow sometimes.
I'm the maintainer for Shoes, and I don't exactly have a big team, so while
I'm literally doing some dev right now, we don't put out new releases on a
super-fast schedule.