Most of the arrangements and transcriptions you will find here have been created using the free, open source music transcriptions software, MuseScore. I have long been a fan of Finale, and I still believe that it is a monument to music transcription software. However, from time to time I go on a hunt to see how far along the free alternatives have come. A few years ago I tried all of the alternatives I could find and MuseScore won that contest hands down. It has really become a viable alternative to the 'big two' (Finale & Sibelius). I have even taken many of my old Finale scores, exported them as MusicXML and then imported them into MuseScore. It works quite well and means that I can keep all of my scores in one place.
Here are some of the basic features: