Here is a comprehensive list of all the added blocks and items in the datapack, complete with what they do.
Blocks
NOTE: By "next to [block]", you have to be within 0.1 blocks of the targeted block, meaning if you walk right into the block or stand on top, you will be "next to" the block.
Checkpoint
Will become the spawnpoint of any player that steps on top of it.
Jump Pad (Level 1)
Gives any player on top Jump Boost 5 for 3 seconds. (approx. jump 5~6 blocks)
Jump Pad (Level 2)
Gives any player on top Jump Boost 10 for 3 seconds. (approx. jump 10~11 blocks)
Speed Pad (Level 1)
Gives any player on top Speed 5 for 3 seconds. (approx. 12~14 blocks/sec)
Speed Pad (Level 2)
Gives any player on top Speed 10 for 3 seconds. (approx. 18~20 blocks/sec)
Transpositioner
Gives any player next to it (not including below) Levitation 7 for 1 second. (approx. fly 7.5 blocks)
Glide Provider
Gives any player next to it (not including below) Levitation 15 for 7 seconds.
Death Pad
Instantly kills any player next to it.
Items (Abilities)
NOTE: Creative mode versions of each ability can be found ONLY in the creative inventory. These versions have no cooldown.
To use any ability, simply right click it.
Dash
Dashes 10 blocks in front of you.
Boost
Freezes you for 1 second.
Gives you Speed 5 for 15 seconds.
For their crafting recipes, refer to the Recipes page.