These programmes are not tested by Musonix.co.uk for being
any more or less suitable to use with the books, except that
they are respectably open-source & free. Open source sequencers
are freeware with the advantage over other free download programs
that volunteers might add pieces of code and keep them updated.
To digress, there may also be old office computers available
free on Freeycle.org
(uk)
If any listings are wrong please feedback.
Windows & Cross-platform midi sequencers
MidiSwing
Jazz
Jazz++ not
yet stable; volunteer help welcome
Frinika
Anvil: not open source;
base is free
Other smaller or less well-known programmes are often cheap or
free: chose the "sort by: freeware" option and then
download.
Linux users have the widest sequencer choice including
Anthem
Mac midi sequencers
MidiSwing
Please feedback
ideas for other free midi sequencers or try
http://freemusicsoftware.org/
http://www.databaseaudio.co.uk/applications.php?category=18