These are some of my favorites:
  ▶︎  Public Events
  ▶︎  HCR Maps
  ▶︎  FS Server
  ▶︎  Fair Play
  ▶︎  Tractor Wars
  ▶︎  Art Gallery
  ▶︎  Server Link Hub

Server Link
HCR Server Link Hub https://discord.gg/RXQeGtuz8U
Fingersoft official discord server https://discord.gg/fingersoft
Fair Play HCR2 community https://discord.gg/AxVfXz3uVc
PR Global Community HCR2 https://discord.gg/PaXsSDJPxX
HCR 2 - World https://discord.gg/UkfkMDapgc
Norsemen https://discord.gg/fA4QpzFfHp
AUSNZ HCR2 https://discord.gg/T648qRWksd
Discord Drivers (Discord team)’ https://discord.gg/hcr2
HCR2 Community Lounge https://discord.gg/JbdAzEfE5k
Climb Canyon League HCR2 https://discord.gg/c7Bz3UxsQu
The HCR2 Link Database https://discord.gg/X6ZDzMH34V
Wild Turbo Community https://discord.gg/MskQchbyrJ
HCR2 Community New OFFICIA https://discord.gg/7UMjynmBKE
HCR2-TIME ATTACK-COMMUNITY https://discord.gg/CsWrTT5rst
SA Hcr2 Friends https://discord.gg/CYzAvkWUr7
HCR2 Kiwis https://discord.gg/pRab4WSDxb
Delta Community https://discord.gg/N4uDnXgRHN
DiscWizarDs HCR2 https://discord.gg/R2G47nMSF6
HCR2 Helper https://discord.gg/vUsMXcvhjb
Butter’s Gutter & #guttergang https://discord.gg/83ffH5yuA7
Hill Climb Racing 2 Community Server https://discord.gg/umaWAXpVQe
FIN3RSOFT HCR2 HOME https://discord.gg/JqBgX2SSuP
HCR2 Public Event (PE) https://discord.gg/eRHPkxHFsZ
HCR2 Challengers Server https://discord.gg/3hfvX22pkY
Hill Climb Racing 2 Legends https://discord.gg/QanH6pgQwT
Canyon Events https://discord.gg/fNDV3hZq6g
Venom https://discord.gg/X4Zu96Qspb
Hill Climber Squad https://discord.gg/ZQkv4uRxWA
Mono Wars https://discord.gg/ZjQUpTVAHu
Scooter Wars https://discord.gg/xcnbnVP85A
Tranctor Wars https://discord.gg/4xEwUbgjnv
Dune Buggy Wars https://discord.gg/k7qEX7C3jN
Monster Wars https://discord.gg/thw9Hp2Xpt
Chopper Wars https://discord.gg/B5e5h8xDua
Hells Tanks https://discord.gg/c5MJ69BkmU
Formula Wars https://discord.gg/ce6EdySr6R
Rally Reborn https://discord.gg/Pq4aYtxYbR
Truck Wars https://discord.gg/ZGK9HbV3qA
Hot Rod Madness https://discord.gg/x3b47FV
SUPERBIKER’s WAR HUB https://discord.gg/uQED5tvsQr
MOONL4NDER https://discord.gg/34DJnd4RbX
MOTO WARS https://discord.gg/Vc2VT9WFMv
Snowmobile Wars https://discord.gg/hgjpHcTajX
In memory of Ch0ppa12 https://discord.gg/BCsaWb5BWx
SuperCar Wars Reloaded https://discord.gg/GuUkwZZ3tA
New scooter wars https://discord.gg/sw7rRQ5RWG
Sports Car Wars https://discord.gg/SX3evAab2g
Mono Kings https://discord.gg/Mb6R2Sg3c7
Rotator Tater-heads https://discord.gg/u66zDDbgPG
Rally Wars https://discord.gg/TwG2uKvtbP
The SuperBike Kings https://discord.gg/TpbXvDKrdk
Moonlander Wars 2 https://discord.gg/tXUcJuV4Ur
HCR2 Adventure Setups https://discord.gg/j6spQbXzjB
Adventure Wars https://discord.gg/JASAah4URt
Passionate Adventurers [PA] https://discord.gg/JVw853FCJt
Adventure Guide https://discord.gg/Y93275vJdx
Adventure Guide Server https://discord.gg/PFyd6a9tKW
Adventute Competition https://discord.gg/eTs2gzn4KC
Turtle https://discord.gg/BMYact68SP
[PR]linus https://discord.gg/u7NkWjK4jt
IO&OI YT https://discord.gg/zh9f6x9ugQ
Vereshchak https://discord.gg/pq3Uta7ht5
Eric YT https://discord.gg/mrDEm4TxyX
Aniket https://discord.gg/MTtCvMkdkU
|PL|FULO https://discord.gg/5W4S867
Cthulhu’s Crab Shack https://discord.gg/fGTmV23tuv
Rose YT https://discord.gg/5mvSbGZ
Vokope https://discord.gg/VjXvNykCNW
Pr0teCT YT(Official) https://discord.gg/GbzjhEXwUV
FuelFire https://discord.gg/yZXqdyph3K
HCR2 GUY’S SERVER https://discord.gg/6gfYFe8JZF
TFM HCR2 https://discord.gg/qX6AfPK9hr
ShOck DC:D https://discord.gg/gGVkHB6mXa
HCR2 YT Community https://discord.gg/BFDzzyfswx
Incognito https://discord.gg/DR3TKCmsJk
MattiHCR2 https://discord.gg/VzDCqUP4cd
Kikos_Hcr2 YT Official Discord https://discord.gg/ez757MVsQX
Noyan The Gamer Community https://discord.gg/QT4zZJVeTm
Jalurisi & Friends https://discord.gg/mEbkCUBNjg
The FunkY ArmY https://discord.gg/AdhVEaTH3Z
Davies HCR2 Community https://discord.gg/PcqBEG2fSJ
HCR2 [SMP} https://discord.gg/vzu2wDPueb
Biclas & Antrax Gaming https://discord.gg/pCHe3Y5cxp
C0RE’s Fan Club https://discord.gg/7yxbQdpKTp
AtXeZ Community https://discord.gg/ENfCCnjSfT
Divyesh SK’s Community https://discord.gg/WWNDJGuKKM
Eydjey’s Community https://discord.gg/4uAj2h257g
M.M Community https://discord.gg/GTpHuwedKp
NATH & STZ-ONE https://discord.gg/eQdYhEKffv
[PR]Lenny Community Server https://discord.gg/mhpWPyBeDX
HCR2 PEC https://discord.gg/hkJWwCe
HCR2 WARS GLOBAL https://discord.gg/6DgDjTfuTp
Tournoi Vehicule Specifique https://discord.gg/YCtKrMNrde
Team vsTeam Tournaments https://discord.gg/7CTXnUZ2cY
Daily Chanllenge Events AU|HCR2 https://discord.gg/5tkVJbsY2d
Adventure Tournament https://discord.gg/JPs9JkhFgP
Friendly Wars https://discord.gg/Ntc2cTUrkU
Quick Racing Community https://discord.gg/RSx6tyGNtU
Hcr2 Tournaments https://discord.gg/V9UAm3umZS
EPIC CHALLENGES WARS (German) https://discord.gg/AABrSZZm8d
Syndicate Racing Tournaments https://discord.gg/tedRabRVMK
Hippo Squad https://discord.gg/25yUqQvgCg
Riders on the Storm https://discord.gg/Gw7fhYuJSZ
Natural Killers https://discord.gg/w39hM4nXZ7
Squad of Bastards Community https://discord.gg/2yuEX6RQZh
[SN]Super Ninjas Officials https://discord.gg/EVvzYfDAF7
[DB]Dumb Brain \ Official Clan https://discord.gg/5ZPvvEZXnr
Fury Legends reborn | 2nd Gen https://discord.gg/FBJHDNnZ5R
Blade Runnrs Clan (BRC) https://discord.gg/W9uwMvArrB
SB Community & Recruiting Server https://discord.gg/BAt8BTYsKk
Dark Spirits https://discord.gg/qW9h5pMyFF
Hcr2 team seekers https://discord.gg/QHt3QQCUBK
HCR2 Art Gallery https://discord.gg/DqaFFJKx4s
Hill Climb Racing PNG’s https://discord.gg/M4rM4NYwbs
HCR2 Public Event (+ Aventure) (FRENCH) https://discord.gg/jHBzZ6SmXU
HCR2 Official Art Server https://discord.gg/nwatqUkq3M
Challenger https://discord.gg/TV7kJbmVTG
Official Hill Climb Racing 2 Indonesia https://discord.gg/u9zN8sX
Suomen Hill Climb Racing pelaajien rekisteroimaton yhdistys https://discord.gg/6PztCjnKs3
HCR2 FRANCE https://discord.gg/a2qDececVA
United Indian’s https://discord.gg/KAZwcQ6dav
French Rally wars https://discord.gg/wtYgbvC8cw
United Legends https://discord.gg/uHJEB76B7x
Ghost Riders https://discord.gg/S45gP9KaPM
WW World https://discord.gg/n6JChad66H
HCR2 Kiwis https://discord.gg/pRab4WSDxb
Team Fear https://discord.gg/5TgaMS9X5d
Silent Scream https://discord.gg/EVP73UKcTW
Terminators https://discord.gg/T6QFUHmq3f
French Academy https://discord.gg/crCftXV
Rhey Team https://discord.gg/mPxeDphRWu
Ghost Riders https://discord.gg/ty7c3VQD8U
PRIDE - Hill Climb Racing Team https://discord.gg/WZEvcPn3F2
RR | WARRIORS https://discord.gg/RnBHMSa6Wh
[RB] Rentnerbrigade / [JB} Juniorbrigade https://discord.gg/4rNDjeu
Critical X HCR Community https://discord.gg/xDGBF7AYfy
Team T2 SINGH https://discord.gg/vtndJqs9hX
Server von Power-Ladys https://discord.gg/QHFGyXchdM
The Fun Racer 1 & 2 https://discord.gg/mjzuNUScjd
HCR2 Bot support https://discord.gg/PteFHRTCrx
HCR2 Daily Bot https://discord.gg/cMqa6q3pTV
Bot Server https://discord.gg/7GwXbfZpQ4
Memer World BD https://discord.gg/TBNAxBCRYA
HCR2 SoulisBot Support Server https://discord.gg/s6gaJU4z44
FrAnk Bot Support https://discord.gg/MDKp9trusd
Hcr2 ArtGallery Bot Support https://discord.gg/EzHaSUfcht
HCR1 Assets https://discord.gg/3UsWqKySXQ
Hill Climb Racing 1 Community https://discord.gg/89sW7UEQfu
TURK ELITE - Oct 17, 2022 https://discord.gg/Athu623MKc

Source: HCR Server Link Hub (a truly excellent discord server) - Aug 21, 2021
‘ (with a few manual additions)

Updated: