I have a project where I am uploading my finished MIDI soundtrack videos to Youtube. I am using MIDITrail. I like the options is has. I tried several others before deciding on this one. Musicanim that you linked above was going to be my choice before I found MIDITrail.
Note that See Music, Musicanim, and MIDITrail are only for viewing previously created MIDI files, and do not allow you to edit files. If you are looking to edit with a piano roll rather than watch a playback, you'll need to explore other options.