Music Notation Software. Gives links mostly to commercial programs. No significant discussion of what the programs do, but a good place for an overview of what programs are (commercially) available.

It should be clear, just from the number of programs listed, that you probably will want to get a demo version of one or two to try them out before decided on your final choice(s), or start with the cheapest (or free) and work your way up to something that works for you.

John