Saads Perfektewelt
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Here I will be posting a glosary of tools that could use some exposure. These won't be sorted though but I will make sure to attribute the proper category to each of these.

Latex tools Visual math editor: This tool helped me passively learn typesetting math equations in Latex. It's free and is something that I highly recommend, it has a GUI that runs on the math environement.
Design Adobe's color wheel: Although bloated, I still recommend this since it packs lots of options to choose from. You can pretty much use this not only for web design and art, but also for fashion. It sort of eliminates the need to seek someone with experience.
Audiophile Squiglink's database: This website is more than a database for everything headphones related, it also has a tool which showcases the best equalizer setups for pretty much every headphone available if you want to make corrections. It comes with a tutorial that I find super user-friendly, which is a plus!
Traveling Bahn guru: GERMANY ONLY. This website sniffs the train costs for you without gathering any data or cookies from your devices. It's simple and very minimalistic without any ads or whatsoever. It sadly fetches the data for the German lines only, but it's great as a tool for planning your next trip.