Milkytracker is one of my favorite music production applications. It is clean, efficient, full of options, and incredibly easy to use. This is free software. Trackers are typically not in the same class for professional music production as something like Logic, Cubase, or etc, and while it is an incredibly old school and hands-on approach to creating music, it is the way I greatly prefer to do things.
This is a modern and up to date 1:1 clone/re-creation of the original Fasttracker II that was extremely popular in the demoscene and chiptune world back in the days of MS-DOS. A little research will show you some rather well known and respected electronic music producers who used this. I have recently started working with it myself and enjoy it. This presents the original and unique approach that Fasttracker II brought to the table. This is free sofware.
Little Sound DJ aka "LSDJ" is a complete tracker (music creation) program for the Nintendo Gameboy handheld. It is available as a ROM image to be used either in an emulator or flashed to a cartridge and used on the real device. I created my Gameboy album "Shades Of Gray Handheld" entirely with this software. It is more flexible than you would believe. If 8-bit chiptune creation interests you, check out the site to see just how much this can really do!
A famous music creation program originally for the Nintendo Gameboy. It was later ported to Apple iOS and Android for a new approach to creating electronic music. It's a step-sequencer and sound generator. I never liked this for the Gameboy, but I used the iOS version to craft some of my older material. That version allows for the import of digital samples. Despite limited capabilities and heavy constraints, it's surprisingly workable and fun to use.
Synthcart is software that turns the Atari 2600 (and compatible) machine into a full fledged synthesizer. Using 9-button "video controllers" as they were called, along with the switches on the console, you can play manipulate the TIA chip inside like a keyboard. This represents my beginning as a musician and was what I used to create my very first music and as such, my first two EP's. It is free to download as a ROM, and available on cartridge elsewhere.
This is one big corporation that, I confess, commands my love and respect. Absolute historical legends in the world of car audio, I've been loyal to this brand since I was old enough to drive a car. I am absolutely addicted to bass, and these guys are among the OG kings of the scene. Speakers, Subs, and Amps for price points from "affordable" to IASCA competition class. My name is BitPusher and I'm a boomaholic. My dealer? FOSGATE.
For custom and prosound modded Gameboys, Gameboy mod parts, etc. This is my trusted and preferred source. The owner does absolute top quality work and clearly cares about what he does, and I believe this because I have personally used his services to build me two RCA prosound modded DMG-01 Nintendo Gameboys which were used for the production of my "Shades Of Gray Handheld" album.
I've always had a fascination and admiration of UNIX. BSD is a much closer relative to the original UNIX than the convoluted Linux kernel. This OS is completely free to use (as if the name doesn't imply that), and powers many things in our world, from a Netflix or Facebook, up to numerous global entities. This server class OS is so flexible that it can be scaled all the way down to single desktop usage. A beautiful and full UNIX OS that I personally use and adore.
While my biggest love is the vintage Macintosh operating systems I grew up with, a second vintage favorite of mine is BeOS. Haiku is a modern re-creation and rebirth of that system. Completely free to use, it is beautiful if you appreciate vintage software. I actually dual-boot with this on my daily driver MacBook Pro! You can use the live CD to test it out. Depending on your usage, it could be a primary or fantastic secondary OS. I love and appreciate the work of everyone behind this!
It would be clumsy and rude to not take a moment to link to the GIMP (GNU Image Manipulation Program.) This mainstay of open source graphic software has been something I've used for more than a decade. Literally every single graphic you've seen on my old website, this website, or as any element of my physical CD releases were all created or edited by yours truly using GIMP.