https://github.com/neimod/ctr
I haz mad Google skillz
As to what these things are, I guess ramtracer has stuff to do with tracing RAM and doing stuff with the traces obtained. ctrtool appears there to be similar to ndstool, but for 3DS, can extract stuff from CXI, CCI and CIA files (details on those are on 3dbrew). ramclkcounter seems to count "clk" s in a RAM trace, whatever those are.