You can download Let's Parkour on CurseForge and Modrinth:
  CurseForge:   https://curseforge.com/minecraft/mc-mods/lets-parkour
  Modrinth:      https://modrinth.com/mod/lets-parkour
To keep a better overview of all mods, the issue tracker is located in a separate repository.
  For issues, ideas, suggestions or anything else, please follow this link:
    -> Issue Tracker
Because of the way mod loader files are bundled into one jar, some extra information is needed to do a PR.
  A wiki page entry about it is available here:
    -> Pull Request Information
Requires the library mod Collective.
Let's Parkour adds various parkour blocks to the game to create an awesome track. It has been made for ModFest: Carnival. It gives players the tools to make parkour tracks more interesting. The effect of each block can be increased by more slabs on top of each other. Parkour blocks can be enabled/disabled separately.
It currently has Slow, Fast, Jump, Soft, Jelly, Slippery, Illusion and Trapdoor Parkour Blocks. See below for their recipes and an explanation of their functionality.
The effect of parkour blocks can be increased by stacking:
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Configurable: ( how do I configure? )
enableSlowParkourBlock (default = true): Whether the slow parkour block functionality should be enabled.
enableFastParkourBlock (default = true): Whether the fast parkour block functionality should be enabled.
enableJumpParkourBlock (default = true): Whether the jump parkour block functionality should be enabled.
enableSoftParkourBlock (default = true): Whether the soft parkour block functionality should be enabled.
enableJellyParkourBlock (default = true): Whether the jelly parkour block functionality should be enabled.
enableSlipperyParkourBlock (default = true): Whether the slippery parkour block functionality should be enabled.
enableTrapdoorParkourBlock (default = true): Whether the trapdoor block functionality should be enabled.
slowBlockBaseSpeedFactor (default = 0.5): The base speed factor of the slow parkour block.
fastBlockBaseSpeedFactor (default = 1.5): The base speed factor of the fast parkour block.
jumpBlockBaseJumpFactor (default = 2.0): The base jump factor of the jump parkour block.
slipperyBlockBaseFrictionFactor (default = 0.95): The base friction factor of the slippery parkour block.
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The Parkour Blocks:
The base parkour slab. Can be used as a normal block, and is used in all other recipes.
The slow parkour slab slows players down when walking on it.
The fast parkour slab speeds players up when walking on it.
The jump parkour slab allows players to jump higher while standing on it.
The soft parkour slab prevents any fall damage when landing on it.
The jelly parkour slab is sticky, and slows players down while they're in it.
The slippery parkour slab has less friction, which makes players slide while on it.
The illusion parkour slab looks similar to a base parkour block, but players will fall right through.
The trapdoor block allows players to stand on it for a very short time, and will then open up.
Careful for the Trapdoor Parkour Block!
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You may freely use this mod in any modpack, as long as the download remains hosted within the CurseForge or Modrinth ecosystem.
Serilum.com contains an overview and more information on all mods available.
Comments are disabled as I'm unable to keep track of all the separate pages on each mod.
For issues, ideas, suggestions or anything else there is the Github repo. Thanks!