While the user licence of minecraft does allow people to charge for modifications (mods), most mods are published for free.
Its Free
You can't mod the console version.
Usually, a mod is free. I have not seen any mod wich costed money.
Its free
The hexxit mod is free. It is actually one of the better and safer mods out there.
No
Well, you need the game 'minecraft' which does cost money. Pixelmon is just a mod for the game 'Minecraft'.
While it is possible and legal to charge for a mod, most mods for Minecraft are provided free of charge. However, most modders will accept donations to help support their work.
Mods are free, but the XBox360 version can't be modded.
The Twilight Forest mod is available for free on websites like CurseForge. Simply download and install it to use while playing Minecraft.
No, it is currently free.
Nope. You HAVE to download a minecraft mod to have it.