I realize you might not agree with all of my picks, and that's fine. Even though I'm making an effort to avoid any biased picks, it's impossible not to include certain things I really like that may be controversial to some. So please, take my word with a pinch of salt and do some research of your own before choosing a specific addon to download.
And now, without further ado, let's get to it
#1 Essential Hack / Addon
Football Manager 2021 Real Names License FixFix fake name of competitions, clubs and awards with their real names in Football Manager 2021.
Essential Graphic Packs
Footbe Logos 2020-21Most unique, uniform & great looking logo style ever. A small pack but with all the top leagues covered.
Trophies Megapack 2021Almost 1200 real trophies to add in Football Manager 2021 with this pack by DazS8.
FMT Stadium Superpack 20211000s of stadium images in a larger size to prevent blurring.
Fez's Enhanced Turf TexturesNew enhanced look of grass textures for Football Manager 2021.
Better Regen Faces - FIFA EditionA compilation of regen faces generated by FIFA 21. Sorted and ready-to-use with Krysler76's script (to match ethnicity and hair colour).
Priisek DarkBase skin alternative with a dark background. Actively updated.
FMEnhancedan enhanced version of the default FM21 skin with a dark alternative and overhauled Player & Club Profiles.
FM 2021 FLUT skin darkA dark skin for the regular FM with FM Touch UI elements.
Heffem Skin 2021The evolution of the Neub Skin, feat. instant result & a low-res variation.
All FM21 Skins
FM21 Transfers & Data UpdateThe best Football Manager 2021 transfer update all-around. Created by pr0 & FMTU.
FM2021 Data Tweaks by SirTavaresCorrected details for players/teams, added missing players/staff. Does NOT include transfer updates.
FM21 Increase Realism MegapackImproves several values for all Nations in-game to increase realism in FM 2021 to a whole new level.
FM21 Leagues Mega Pack by @[email protected]Expand the playable leagues in FM2021 with 216 new nations! With real rules, calendar and structure.
Wonderkids Reboot 2021 by JGAn extensive database update that adds multiple young talented players to your FM2021.
Football Manager 2021 WonderkidsThe ultimate guide to discovering all Football Manager 2021 wonderkids with personal recommendation ratings.
Football Manager 2021 Best CoachesHundreds of highly rated coaches in FM 2021 to get you 4, 4.5 & 5 stars in all training areas.
FM2021 Top BargainsTop quality players you can get for a relatively cheap price in FM21 on the first summer transfer window.
FM 2021 Best Free TransfersMost notable free agents when starting Football Manager 2021.
FM 21 Best Transfer TargetsRated 170K players & gave them a score for the position. Plus expected scores based on each league.
FM21 PA -85 -9 -95 -10The full list of young talents with the highest negative potential ability in FM 2021.
Clubs Starting BudgetsInitial transfer and wage budgets for a dozen of popular leagues.
FMS Editor 21Fully-featured real-time editor with a scouting edge for Football Manager 2021.
FM Genie Scout 21gExtend the possibilities of finding, sorting & shortlisting players & staff on Football Manager 2021.
Essential FM 2021 Search FiltersA collection of filters for all player & staff roles to save you time when searching for transfer targets in FM 2021.
Essential FM 2021 Custom ViewsA collection of views for 4 different areas in FM 2021, including squad, fixtures, scouting & staff search.
DarkHorse's Custom USA 10 Tier SystemAn original American system complete with over 700+ original Clubs with custom graphics.
FM21 World Super LeagueThe popular super league series returns for the 5th year. 1004 clubs from 73 countries in 7 tiers.
Feel free to post your nominations in the comment section below and I'll consider them for my next update.