Arch is a distribution of Linux I have started using recently. It tends to have a lot of very interesting and specialized software. These are just a few of the massive number of results I got for a search of the AUR for the keyword "brain", like so: "packer -Ss brain"
aur/xmind 3.2.1-1 (332)
Brainstorming and Mind Mapping Software
aur/defrag 0.08-1 (66)
A braindead simple and filesystem agnostic defrag script
aur/brainparty 0.5-5 (45)
Brain Party is a puzzle game made up of 36 minigames designed to push
your brain to its limits by testing memory, logic, mathematics, reaction
time and more
aur/bfc 1-3 (39)
A minimalistic brainfuck compiler.
aur/awib 0.3-2 (25)
A brainfuck compiler written in brainfuck, able to generate x86 linux
binaries, C code, Ruby code, Go code and Tcl code.
aur/autozen 2.1-3 (18)
A binural brainwave generator. Cause the user to experience an altered
state of consciousness. Wear headphones. Don't use if you suffer for
any kind of epilepsy and use at your own risk!
aur/cryosleep 0.2-1 (7)
The Cryosleep program generates changing noisewaves with a superimposed
brainwave that are nice to listen to and vary over time
aur/dream-strobe 3-1 (17)
Stroboscope implementation for GNU/Linux console. Also called 'Dream
Machine' or 'Strobe'. Can be used to alternate state of consciousness
by affecting brainwave frequencies. Use only at your own risk!
aur/professor-fizzwizzle-1 1.02-1 (1)
Professor Fizzwizzle is a fun, mind-expanding puzzle game, where you take
control of the diminutive genius, Professor Fizzwizzle. You must help
the professor use his brains and his gadgets to solve each exciting level.
aur/neurolab 1.2.2-1 (1)
Neurocognitive Linguistics Lab is an approach to linguistics which
uses relational networks to model what the brain actually does when it