Since 2020 I’m writing the new scores using MuseScore, an excellent software that is quite more powerful than NWC (see below), which is also free and Open Source. And even more It is really easy to use: within three days I was able to use it at a good level.
For all the scores produced before 2020 I used NoteWorthyComposer, an editing tool inexpensive ($50) compared to other non-free software, yet abundantly sufficient to produce good sheets music.
Unfortunately NWC since several years was not updated, although the site still continues to sale it.