Ohh boy you should search a bit in ther websites first...
I think the easiest one to use is Chris's OFP Script Editor.
Not sure if I have a link...
It's really good cause it can help in making scripts and making mission stuff. Like briefings, overviews, ammocrates, units with certain weapon outfittings, music, sound, respawn, and .ext files. It helps by giving variables and names and important parts of your script colors so you can recognize things easier.
I would try a search engine or one of the many sites devoted to OFP. It's a must get. :thumbsup: