"Developed originally by arc in 2010 and picked up by Tomek starting early 2016, TMUnlimiter has brought revolution to the TrackMania track-editing world by being the first and only tool that patches the official, ingame track editor with new functionality. Originally with only blockmixing, the modification brought us oversized maps & cross-environment mixing; Tomek's updates added changing car parameters, block rotation & movement, extended terraforming options, plus more advanced custom blocks & scripts."

This does reqiure modding the game files. if that is not your thing, try a car or texture mod which does not.

Note: If you are using Steam you will have to switch the exe with a standalone exe.
It should be located in: C:\Program Files (x86)\Steam\SteamApps\common\TrackMania United\
And copy the new TMForever.exe into the folder, Unlimiter should work after this!
DL: https://dl.dropbox.com/s/p7ggsos0uuyhli5/TmForever.exe?dl=0

Step 1: Download the mod from: http://3z.sytes.net/download

Step 2: Follow the instructions in the Readme.

Now its time to play with the mod!

Step 1:launch TMUnlimiter.exe in the game files
Step 2: proceed to make a new track
Step 3: Now there should be loads of blocks, bigger grid and you can place blocks on top each other (Newer version contains unused blocks from the game)

Thats it so, happy building!