This question comes up repeatedly, so probably the easiest thing would be for you to use the search capabilities of the community to look for "post processors". You'll see many messages about the topic.
Knowing that your machines have Fanuc and Mitsubishi controllers really not specific enough. Hundreds of machines have either of those controllers. The post processor is usually built to deal with a specific machine manufacturer. The motion g-code, things like G01, G02, G03, etc are pretty much the same for every controller. But where things get specific is in the M-codes (that turn on/off machine functions, custom or more detailed G-codes, and particularly the code needed to initiate a program, do a tool change, etc. Sometimes G-codes that are perfectly fine on one machine cause an error on others.
So, anyway, if you have machines that are popular enough, you might be able to find a post-processor out there that will work, otherwise, some names, like Austin NC, are suggested in many of the messages.
