Been meaning to do this for a while, but I finally got around to uploading my awesomely awful IDE.
mahlemiut/cpcbuilder ยท GitHub (https://github.com/mahlemiut/cpcbuilder)
It definitely builds on Linux systems (Ubuntu, at least), but should also build on Windows or OS X. Qt 4.6 or later required to build, uses Pasmo for assembling, so you'll need that to run it.
This sounds cool. Why do you say it's crappy?! Just because it isn't finished doesnt make it bad, and it's open source!
Any chance of a screen shot?
I'm sure graphics could be handled much better than it is, and making some sort of simple libraries would be useful, too. Probably a lot of things that could be be done much better, really, but it does more or less work.
Really good to see some more dev stuff for Linux... it looks great :)