G'MIC: Enormous collection of filters and effects for image editing in GIMP and Photoshop.
Hannah Detterbeck: Cozy cartoon portraits, postcards, maps, commissions etc.
Piskel: Create free pixel sprites in the browser.
Public Domain Image Archive: Huge collection of historic paintings and drawings completely free for use.
Obsolete World: Nostalgic art from another planet.
Geoguessr: Get dropped into random Google Street Views around the world and try to work out where you are.
Good Old Games: DRM-free video game store curated for preservation and personal ownership.
Lichess: FOSS chess.
Seterra: Learn geography!
Timeguessr: Guess where in the world and what year a given photograph was taken.
David Rumsey Historical Map Collection: Thousands of high-quality maps, charts, and globes from throughout history.
Digital Public Library of America: Open access to historical photographs, books, manuscripts, etc. from various American universities and museums.
Edward Curtis's The North American Indian Collection: Some of the best historic photographs I've ever come across. Some other good collections on the same site as well.
Enslaved: Comprehensive historical database of the Atlantic and Indian ocean slave trades.
Folklore Archives, 1878-1930: Complete collection four historic folklore journals, hosted by the University of Pennsylvania.
Getty Search Gateway: Search the Getty's online repository of freely available images.
Historic Bottle Identification: Fantastic archaeological resource for turning trash into valuable dating information.
Megalithic.co.uk: Database of ancient archaeological sites.
Projectile Points Identification: Comprehensive database of all projectile point types found in North America.
University of Pennsylvania's Serial Archive: Massive directory of freely accessible journals, magazines and newspapers from throughout history.
98.css: A design system for building faithful recreations of old UIs.
ASCII Generator: Text to ASCII generator.
Broider: Easy GUI tool for creating CSS borders.
CSS Shadow Generator: Little cheat program to easily create various CSS shadows.
CSS Zen Garden: A collection of various CSS themes for inspiration.
Dividers: Big list of ascii dividers to copy and paste.
Everforest: My favorite color palette for tech stuff.
Guestbooks by Meadow.Cafe: Easily insert a guestbook into your page.
Hover.css: A large collection of premade hover effects to add to your CSS.
Bear Blog: Minimal, text-first, privacy-respecting blogging platform. Has a great community and a built-in discovery feed.
Guestbooks by meadow.cafe: Easy way to insert a guestbook page into a personal site.
Neocities: Free website engine and host. Has a fantastic community. This site is built with Neocities.
Wiby: Search engine for the hobbyist, indie, and vintage web.
Album Cover Search Engine: Easy way to find almost any album cover you want by searching dozens of different music hosting sites at once.
Black Metal Sketch List: Very handy guide for ethically listening to a genre of music that can be extremely unethical at times.
Every Noise at Once: Map of pretty much every music genre ever, with examples.
FMHY: How did this get here? I definitely didn't put this here.
Jellyfin: FOSS software for streaming local media across devices. Like Plex but, you know, better.
Poster Database: Comprehensive database of movie and TV show posters, both official and fan-made.
Fire Draw Near: Deep dives on the history of Irish and Irish-adjacent traditional folk music.
History of Philosophy Without Any Gaps: What is says on the tin. Incredibly comprehensive.
In Our Time: Eclectic educational podcast about history, literature, science, philosophy, religion, etc.
Supermassive: Fun and accessible astronomy podcast by the Royal Astronomical Society.
Uhh Yeah Dude: I don't know how to write a description for this. Best podcast of all time. 2006 for life.
The Worst Idea of All Time: Two guys watch and review the same awful movie every week for a year. Pure insanity.
Librivox: Free audiobooks of public-domain literature recorded and uploaded by the community.
Oldstyle Tales Press: Analysis/summaries/art/essays focusing on classic English horror and gothic literature.
Project Gutenberg: Free books in the public domain.
98.js: Mini Windows 98 OS for the browser. Excellent reference tool for recreating a Windows 98 aesthetic.
Asciiquarium: Animated ASCII aquarium art for the terminal.
Cbonsai: Animated ASCII bonsai tree generator for the terminal.
Miniflux: Minimal, self-hosted, open source RSS reader.
Rockbox: FOSS firmware for a wide array of old mp3 players.
Use & Modify: Excellent collection of free fonts.
African Biographics: Video essays on modern African history and politics.
Angela Collier: Accessible video essays and deep dives on science, astronomy, and physics.
Bread on Penguins: Linux channel that explores niche, technical topics in an accessible way.
Chad Chad: Hilarious exposés on weird, awful TikTok/Instagram garbage.
Cogito: Eclectic and humorous video essays on world history.
The Elephant Graveyard: Freakishly creative, well-edited, original pieces on the awful world of the Joe Rogan-sphere. More audiovisual art pieces than video essays. Real high-grade hater stuff.
F.D. Signifier: Video essays on social justice, black American culture, healthy masculinity, and leftist politics.
Izzzyzzz: Original and engaging deep dives into niche 2000-2010s internet and video game cultures.
JoshStrifeHayes: Thoughtful, positive, long-form MMORPG content.
TheLinuxCast: Consistent thought pieces and how-tos related to Linux.
TheLinuxExperiment: Linux and FOSS news and updates.
LJ: Well-researched and measured video essays on crime, violent extremism, cults, and other controversial topics.
Matt Orchard: Thoroughly researched and well-written video essays about true crime and public figures.
Memoria: Extremely funny and at times surprisingly creative and inspirational video game playthroughs/commentaries.
Napoleon Blownapart: Video essays on the increasingly unscrupulous world of martial arts.
Jackson Crawford: Norse mythology and related topics taught by a leading expert in the field.
Opiuhm: Internet horrors and mysteries covered by a fantastic writer/narrator.
Weird Reads with Emily Louise: Video essays on strange, cultish, and obscure history.
Kettlebell Exercise Guide: List of pretty much every kettlebell exercise along with targeted muscle groups, difficulty level, visual example, etc. Has similar tables for bodyweight exercises, yoga poses, etc.
Ratfactor's Illustrated Guide to Folding Fitted Sheets: One day I'll learn...
WindowSnap: Look through random windows scattered throughout the planet.