The other gravity mods does not changing players gravity exactly how you want it from a command, so i made this one :-)
command: /setgrav <name> <number>
Default gravit: 1
Half gravity: 0.5
Extreamly high grav: 100 (not recmomanded)
Very low gravity 0.01
Extreamly low gravity 0.001 (let you jump over the cloads [not recmomanded])
Anti gravity starts from -0.001
and all other combinations...
good mod if you are used to Minecraft gravity
just set to 1.2-1.4 for a more Minecrafty experience.