MIDI

Samples were recorded with Windows' internal soundfont or the Arachno Soundfont, using VirtualMIDISynth.

NES

Made with Dn-FamiTracker (or older branches).
NSF files can be opened and played with NSFPlay, and some NES emulators *.
Small warning, some tracks that use more than one expansion chip may not be able to be played correctly on emulators (if not at all).

PC-98

Tracks made (primarily) with the PMD driver and kuma4649's mml2vgm.
MML text files can be compiled and played with mml2vgm right away (recommended), or you can compile with PMD yourself and run on players like FMDSP (requires an emulator (or a physical PC-98)).