GPL'd Embedded Development Tools?

An Anonymous Coward queries: "Is anyone aware of free tools available for embedded digital signal processors? A number of companies (such as, I think, Motorola) used to produce DSP-optimized versions of gcc and the like for their embedded processors, but these days such code seems to be lost. I am a student trying to do homebrew DSP development for some RF apps, and the cost of all the development tools is staggering (not to mention none of them seem to run under Linux). The sole factor in deciding which DSP I use is the availability of development tools -- any suggestions?"