Vocaloid + UTAU + Misc Albums (Audio qualities vary, but 320kh MP3s common)
DLS: Mega, Google Drive, Misc
http://mikudb.moe/

Video Game + Anime Soundtracks (Usually 320kh or hq range and direct CD rips)
DLS: Mega, Mediafire
https://www.sittingonclouds.net/

Video Game + Misc Soundtracks (Mix of manual uploads and CD rips, requires individual file downloads so don't use for large albums)
DLS: Direct from site
https://downloads.khinsider.com/

Misc Albums (Anything uploaded onto Deezer, always highest possible quality + flac.)
DLS: Direct from site, uses a Discord bot
https://discord.com/invite/5GVVBhrmaR

Misc Albums (Can be any quality of upload; googling the album and adding "archive.org" to the end may net better results than searching on the site directly)
DLS: Direct from site
https://archive.org/

Misc Tracks (Requires manual download of individual tracks, but usually has decently high quality; use when other methods fail)
DLS: Direct from site
https://free-mp3-download.net/

YouTube Tracks (Downloads songs in the highest possible quality, and includes metadata when possible)
https://ytmdl.deepjyoti30.dev/

SoftArchive's Music Section (Many obscure albums. Some downloads also have options for FLACs)
DLS: Misc
https://sanet.st/music/

Streaming site with a UI similar to Prime Video (Beware of Pop-ups)
https://sflix.to/home

Streaming site that attempts to lessen the amount of Porn Ads n Pop-ups
https://soapgate.org/

Google Drive index of various movies and tv shows
https://rinzry.stream/0:/

Emulators, Roms, Manual Scans + More (Supports all 16 classic systems, from the NES to Wiiware and the PSP)
DLS: Direct from site, External links
https://vimm.net/

Emulators (Emulation Gametech Guide's updated list of almost every working emulator available)
DLS: None, hosts only links to external sites https://emulation.gametechwiki.com/index.php/Main_Page

3DS Homebrew/Hacks Guide (Remove restrictions + just make your shit go nuts)
DLS: None girl this is a textual guide
https://3ds.hacks.guide/get-started

Retro Roms + ISOs (Release dates ranging from 1978-2010)
DLS: Direct from site
https://www.myabandonware.com/

Large ROM collection for misc platforms
DLS: Direct from site
https://squid-proxy.xyz/

Another ROM collection for various platforms
DLS: Direct from site, MAY have some weird download restrictions
https://romhustler.org/

Even more ROMs for a bunch of different platforms
DLS: Direct from site
https://www.romnation.net/

Retro/Modern ROMS (PS2, PSP, PS VITA, 3DS, Switch, GBA, GAMECUBE, NDS, N64, SNES, WII, WII U)
DLS: Misc, large files require split downloads
https://www.ziperto.com/
Spanish site for more Retro/Modern ROMS (PSP, PS VITA, PS4, 3DS, Switch, PC)
DLS: Misc, large files require split downloads
https://nesgm.net/

Switch Games (NSPs, XCIs, Homebrews, & CFWs)
DLS: Misc, large files require split downloads
https://nxbrew.com/

Console/Emulator based repacks (Windows only)
DLS: Mediafire, Misc
https://www.gnarly-repacks.site/

Miscellaneous Scene releases (Windows, Mac and Linux)
DLS: Misc
https://scnlog.me/

PDFDrive (78mil+ PDFS, guide/life self-help books, biographies, and more. No link shorteners, files hosted on site)
DLS: Direct from site
https://www.pdfdrive.com/

eBooks/ePubs (10mil+ books and 84mil+ articles)
DLS: Direct from site, 5 free daily downloads w/o signing in
https://z-lib.org/

eBooks and Texts (20mil+, making a free archive account grants you access to even more)
DLS: Direct from site, misc
https://archive.org/details/texts

eBooks and Torrents, textbook focused (Most popular site for this kinda stuff)
DLS: no idea i havent used it
https://libgen.is/ or https://libgen.fun/

Manga, anime streaming and light novels
DLS: Misc
https://theindex.moe/