Remove backgrounds from JPG/PNG images, completely free, no forced registration or paywall: Pixian AI.
Online language translator, much better than Google Translate: DeepL Translator.
PDFTK Builder, Free PDF editor program (Join, split, rotate, watermark, number pages): PDFTK Builder.
Headphone Equalization graphs on Reddit, get the best sound quality out of your cans: Headphone EQ Graphs (by Oratory1990).
Radio Garden, listen to different radio stations around the world: Radio Garden.
Online photo editor: Photopea.
Music Theory for Musicians and Normal People: Music theory by Toby Rush.
A low-poly 3D model editor: Blockbench.
Programmer's Guide to XYZ, RGB, ICC, xyY, and TRCs: Color guide.
How software gets color wrong: Color guide 2.
a summary of electronics written for hobbyists or people with little technical knowledge: Summary of electronics.
Experiments on a $50 DIY air purifier you can make in 30s: DIY air purifier.
Research: How Subtle Class Cues Can Backfire on Your Resume: How subtle class cues can backwire on your resume.
Explanatory articles on physics, mathematics and other phenomena: Ciechanowski.
How is search so goddamn bad? A ‘Case Study’: Case study.
You can learn to read Middle English: Middle English.
How to Find Hidden Cameras in your AirBNB: Guide.
The Physics of the Universe - Difficult Topics Made Understandable: Physics of the Universe.
Just the Recipe - Skip the clutter on any recipe site: Just the recipe.
3d-mapper - Create your own 3d map online: 3d-mapper.
Coffee-to-water ratio calculator: Coffee-water ratio calculator.
The Old-School Fire Effect and Bare-Metal Programming: Oldschool fire-effect programming.
The Ultimate Oldschool PC Font Pack: Oldschool PC Fonts.
Every mountain, building and tree shadow mapped for any date and time: Shadow map.
PeakFinder: see the view from any mountain or hill: PeakFinder.
Flash Museum: archiving flash games and animations and making them playable again: Flash Museum.
Winamp Skin Museum: Infinite scroll through 80k Winamp skins with interactive preview: Winamp Skin Museum.
What kind of glue to use to attach this to that: This to that.
Customizable free loading SVGs: Loading.io.
Extract images from any webpage: Extract pics.
Resources, Tools and Basic Information for Engineering: Engineering Toolbox.
Discover how to get anywhere from place A to B: Rome2Rio.
When you need to get a book or DVD or rent a game but don't know which libraries have it?: WorldCat (Find items in libraries near you).
A collection of tools designed to help neurodivergent people with tasks they find overwhelming or difficult: Goblin.tools.
CARI Institute: an online community dedicated to developing a visual lexicon of consumer ephemera from the 1970s until now: CARI Institute.
Service manuals for most vehicles: Service Manuals.
A tiny website with fun games and stuff: neal.fun.
Convert images of text to actual text: Online OCR.
Find hidden places in a city you want to visit: Atlas Obscura.
A free, easy-to-use tool to help you collect, organize, annotate, cite, and share research: Zotero.
Online Mathematics Editor: Matcha.
Mecabricks - Online LEGO modelling: Mecabricks.
Create interactive experiences for your webpage: nunuStudio.
3D Particle Playground: Particle Love.
An open source collection of Design Principles and methods: Design Principles.
How to Write Articles and Essays Quickly and Expertly: Writing Guide.
Render anything as HTML checkboxes: Checkboxland.
An Interview with Harry Kahne, Whose Brain can do Six Things at the Same Time: Multiple Mentality Course.
Open source geospatial analysis tool for large-scale data sets: Kepler.
Hiding Images in Plain Sight: The Physics Of Magic Windows: Magic Windows.
Program that keeps your system time accurate: NetTime.
Photographic reference scale: Photographic reference scale.
Grid-based pinboard for note taking: Manifest.
How to Write Email with Military Precision: Writing Guide.
What makes a picture good: Photography Guide.
Teach yourself computer science: Computer Science Guide.
Professionally designed spreadsheet templates for business, personal, home, and educational use: Vertex42.
Free 3D book cover mockup generator: 3D Mockups.
OpenDyslexic: A typeface for Dyslexia: OpenDyslexic.
Computer mouse buying guide: Mouse guide.
About printer tracking: Is your printer spying on you?.
Free online editor for animated sprites & pixel art: Piskel.
Brain Workshop - a Dual N-Back game: Brain Workshop.
Rainmeter, desktop customization tool: Rainmeter.
Best stargazing locations: Dark Site Finder.
Skip those annoying websites which force you to watch ads to get a link: Ad-Link Bypasser.
Your life in 3672 free calculators: Omni Calculator.
Free Amazon price tracker: Amazon price tracker.
Make web pages printer-friendly and convert just about any file to/from PDF: Print friendly.
Which Book - Discover your next great read: Which Book.
Flowchart maker: Flowchart maker.
Application for wireless communications and data transfer between devices over local networks: KDE Connect.
How to create images of hidden objects around a corner in under 10 minutes: non-line-of-sight (NLOS) imaging.