Kodi links:
KODI | Download (Windows, Android & Android TV, Linux, RPi, macOS, iOS, tvOS, webOS) | Releases | Official Addons | UnOfficial Addons
Raspberry Pi: LibreELEC | Raspberry Pi Imager / Noobs, PINN, PiBakery, BerryBoot, BerryBoot Images

Remote: Yatse: Kodi remote control and cast | Kore, Official Remote for Kodi (Official Kodi Remote for iOS) | Remote for Kodi / XBMC

Apps (useful, in addition to using Kodi):
Wako (Trakt, RD, subscription) | PlayStore link | App Store link | GitHub link | Addons:
Helios CC | Config: Providers URL CC & Orion | scraper4wako
Nomos CC | Config: Plugins URL CC
Oola CC | TMDb adult content CC || Official: IMDb | The Movie DB | Kodi Select | Watch Now | Watch on iTunes | Premiumize Explorer
Unchained (RD) | PlayStore link | F-Droid link | GitHub link
Other (streaming apps):
Stremio (Win, Linux, macOS, Android, Android TV, iOS) | Web App | The Great List of Stremio Addons, Awesome Stremio
Syncler (Android, Android TV, subscription) | Syncler Packages, Repository for SynclerScrapers
Weyd (Android TV, subscription)
Rokkr / Watched (Win, Linux, macOS, Android) | URLs: HUHU.TO, OHA.TO, OLA.TO
Dezor (Win, Linux, macOS, Android) | URLs: KOOL.TO, VAVOO.TO

Accounts (required and preferred for most addons):
Trakt | "activate" "status" | mdblist.com, couchmoney.tv
Premium: RealDebrid | "activate" "API Private token" > ResolveURL URLResolver (dependencies) | AllDebrid, Premiumize, Easynews
Orion - Media Index | "panel" | Free Daily Links Limit: 100
Youtube | "activate" | Personal API Keys FAQ, How to Create and Setup Youtube API Key, ID and Secret for Kodi?
Optional (API):
IMDb | TMDb | TheTVDB | TheAudioDB | OMDb | SIMKL | AniList | Fanart | OpenWeather | Last.fm | Libre.fm

Best Kodi Addons (Free, RealDebrid) by categories

Video:
Fen / Fen Light (RD) | Repo: dEXE | Providers: CocoScrapers
Seren (RD) | Repo: dEXE, Nixgates Repo | Providers: a4kScrapers CC , Orion CC | Themes: themes for skins
Umbrella (RD) | Repo: dEXE, Umbrella Repository | Providers: CocoScrapers
a4kStreaming (RD, IMDb/no Trakt) | Repo: dEXE, a4kStreaming Repository | Providers: a4kScrapers CC
TheMovieDb Helper | Repo: Repo of all Repositories, jurialmunkey Alpha Repository | Players: tmdbplayers CC, gplayers CC

Torrent
Elementum (Pulsar/Quasar fork) | Repo: dEXE | P2P Providers: Burst, Context Helper
Jacktook (RD) | Repo: dEXE, Jacktook Add-on Repository | Indexer: Torrentio CC, Elfhosted CC, Jacktook Burst, Plex, Jackett, Prowlarr
Torrest | Repo: Torrest Add-on repository

Other
The Crew / Ghost, Homelander, Moria, Absolution (RD & Free) | Repo: THE CREW REPO
The Promise (The Oath fork) (Free & RD) | Repo: The WareHouse Repository
POV (FEN fork) (RD) | Repo: kodifitzwell repository
Ezra (FEN fork) (RD) | Repo: Ezra Repository
TAZ19 (FEN fork) (RD) | Repo: Octopus Repository
LooNatics Empire (Venom fork) (RD & Free) | Repo: The WareHouse Repository
Dynasty (RD & Free) | Repo: The WareHouse Repository
Asgard (RD & Free) | Repo: Narcacist's Wizard Repository
Shadow (RD) | Repo: Narcacist's Wizard Repository
Magic Dragon (Free & RD) | Repo: Narcacist's Wizard Repository
Nightwing (Free & RD) | Repo: Magnetic Repo
Scrubs v2 (Free) | Repo: dEXE, JewRepo
Free99 (Free) | Repo: dEXE, Diggz Repository
Crackle (Free) | Repo: dEXE, Official

Video All in One:
Gratis | Repo: dEXE
Bee | Repo: dEXE
UK Turk Playlists | Repo: dEXE

Programs / Services:
Realizer (RD) / Premiumizer | Repo: dEXE
RealDebrid (RD) | Repo: dEXE
Account Manager (RD, AD, P) | Repo: dEXE

Cartoons & Anime:
WatchNixtoons2 | Repo: dEXE
Kaito / Otaku | Repo: Hooty's Repository

Subtitles:
SubLoader (service) (AutoSubs/autoSRT/SubLoader Fork) | Repo: dEXE || Subtitles Mangler (Official)
Titlovi (Unofficial 1.3.0) | Repo: dEXE | WebPage, GitHub
a4kSubtitles | Repo: dEXE, a4kSubtitles Repository
OpenSubtitles Plus (OpenSubtitles.com) | Repo: dEXE
OpenSubtitles.org by OpenSubtitles with dual subs | Repo: dEXE
LocalSubtitle | Repo: dEXE

exYU:
BauBau Klik Premium (filmovi, serije, crtani, tv, ostalo...) | Repo: dEXE

Sport:
Daddylive | Repo: dEXE
The TV app | Repo: dEXE
Mad Titan Sports | Repo: Magnetic Repo
Rising Tides | Repo: Rising Tides Repository
Sport HD | Repo: Bugatsinho repository
ApeX Sports | Repo: Arxtic Ape Addon Repository
The Crew Sports | Repo: THE CREW REPO
The Endzone | Repo: Grindhouse Repository
The Loop | Repo: Loop Repository
Sportowa TV | Repo: mbebe

Sports Replays:
Full Match TV | Repo: dEXE
Gratis | Repo: dEXE
UK Turk Playlists | Repo: dEXE

IPTV:
BauBau Vavoo | Repo: dEXE
Json IPTV | Repo: dEXE

Music:
MP3 Streams | Repo: dEXE
Radio | Repo: dEXE, Official
TuneIn Radio | Repo: dEXE
TuneIn2017 | Repo: dEXE
YT Music EXP | Repo: dEXE
datpiff Mixtapes | Repo: dEXE
Dash Radio | Repo: dEXE
FDJ.HD | Repo: frenchdj repository

XXX:
Cumination | Repo: dEXE, Dobbelina Repository

PVR:
EON PVR Client (RPi, Linux, Android) | Repo: dEXE

Gaming:
Internet Archive Game Launcher, Retro BIOS Tool | Repo: dEXE, Zach Morris Add-ons
ROM Collection Browser | Repo: dEXE
Advanced MAME Launcher, Advanced Emulator Launcher | Repo: Official
DOSBox | Repo: Official
Moonlight launcher (RPi, Linux) | Repo: dEXE

Legal Subscription Streaming (inputstream.adaptive & widevine):
Whitelodge | Repo: dEXE
Netflix | Repo: CastagnaIT Repository
Amazon VOD | Repo: Sandmann79s Repository
Discovery+ | Repo: Dis90 add-on repository
HBO Max | Repo: SlyGuy Repository
Disney+ | Repo: SlyGuy Repository
Hulu | Repo: SlyGuy Repository
Paramount+ | Repo: SlyGuy Repository
Spotify | Repo: -
Deezer | Repo: -
Tidal | Repo: TIDAL2 Addons

Miscellaneous:
Orion | Repo: dEXE, Orion Repository
Yatse Add-on for Kodi | Repo: dEXE, Yatse Kodi Add-on repository
KCleaner | Repo: dEXE

Skin:
Estuary Mod (pkscout) & Others | Repo: Repo of all Repositories