If you have a tool or tutorial you want to see added to this list, let us know.

TUTORIALS

Track Building
[Guide] Making a Map: The Basics
How to embed objects
Basics of league mapping
Advice on track building from Rxerox, Defacer, Ganjarider, and Smok3y
What is "disp. cost"?
Reducing Display Cost
Converting Platform to Race
Change Time of Day
Ultra Quality Lightmaps

MediaTracker
MediaTracker Shortcuts
Loopcam Tutorial (very short)
How to add a Transition Fade
Make it rain
Make a GPS
Instant Scenery Change
Screenshot Tutorial
Snapping Keyframes
Make it rain
Transition fade
Making an Outro
FxCameraMap (broken feature)
Triggers and Clip Numbers

Texture Mods
How to use mods (as a track builder)
Getting Locators to work with Pack.Gbx mods

Visual Texture Guide - Resource for modders
How to do the N and S tile
Discussion about transparency
Managing reflections or shine
Q&A about TM2S modding

ManiaLinks
Marcel's ML tutorial over on FT forum

ManiaExchange
Cool search functions (for MX)
Find Random Tracks by Environment: Canyon / Stadium / Valley

Other
Custom Music
How to Make Google Drive host loc files
A word about Locators + Dropbox Links
Tutorial - Dynamic Dropbox
Open downloaded .gbx tracks/replays in both TMF and MP.
Synced maps folder across multiple computers
Open downloaded .gbx tracks/replays in both TMF and MP.
Saving replays with all cars online
How to Recover password protected maps
Tips for Driving Faster

ASSETS

Assets from Nadeo
Canyon Font (old)
Texture Tile Websites (asset for modders)
Trees (asset for modders)
bigger MX logo

TOOLS

External Tools
GbxDump - Gbx File Dumper Application
MapEdit - A blockmixing tool for Maniaplanet games

Signs
MX Sign Pack 2.0
Brilliance 'n' Metals Sign Pack by Sparkster
The giant MX SIGN PACK (946 signs!)

Editor Plugins
AK's Plugin Collection
AutoDeco+ & Pipes

Gamemode Scripts
Endurance
TimeAttack mode for splitscreen

Obsolete and/or Dead?:
TM2 Unlimiter
TrackStudio 2.0
MpEditorUnlimiter
GBXedit - TM2 tool for blockmixing
mpbc - custom blocks in TM2
MLC - Manialink converter (dead)
MBX - Manialink Banner Exchange (dead)
TMAVATARS (dead?)
TMSTICKERS (dead?)
TM Canyon Nations car skins (dead?)
TMSIGNS (from doben) (dead?)
Cool signs for Trackmania² (by Elmigo) (dead)
mxmaps manialink (dead?)