No$cart
From CPCWiki - THE Amstrad CPC encyclopedia!
A utility by Nocash which converts a disk image to a cartridge.
The tool hasn't been tested on the GX4000 so cartridges that are created may not work on it. You should test this to be sure.
In addition if you choose to convert a game that uses 128K ram ONLY (either it was made this way or a bad "crack" that needs 128K) then this will also not work on the GX4000 because it has 64k RAM.
The tool is easy for the non-programmer to use.
Technical
The created cartridge image has the OS, BASIC and Amsdos embedded in it and the data from the disk image (tracks/sectors). The image contains a patched Amsdos that reads from the cartridge rather than reading from disk.