useful free software:
Filezilla
FTP Client for website management.
Open Office
Office suite replacing similar offering from Microsoft.
Gimp
Photo editing software.
Musescore
Music score editing software.
7-zip
File management and archival tool (zip, rar, etc).
foobar2000
Audio playback and management with a simple interface.
lame
MP3 encoder which can be used in Foobar2000 or alone.
Pdfcreator
Printer driver which allows easy export of PDF, JPG, etc.
Pdf-splitandmerge
PDF split and merge utility.

free sheet music:
delcamp
delcamp
imslp.org