This is basically a complete redo of the old Aether mod.
There's also an Aether Legacy mod, which is a port of Aether I which is updated for newer Minecraft versions.
LINKS:
Aether Legacy https://minecraft.curseforge.com/projects/aether-legacy
Aether II https://minecraft.curseforge.com/projects/the-aether-ii
PLEASE NOTE: Aether II requires a dependency mod called OrbisAPI, Aether Legacy however, doesn't require anything.