Play it in survival mode or creative mode. Don't press the multiplayer mode.
You get a mod, such a Single Player Commands.
install the aether mod
yes there is a mod for it
/op [player name] make player a mod /deop [player name] make an already mod not a mod
do /clear inventory or just /clear
It is not possible unless you download the single player command mod.
Yeah for a mod that spawns animals anywhere try SPC (Single Player Commands).
Try a mod. You could use InvEdit or SPC (Single Player Commands).
Yes, it's called Single Player Commands (SPC)
If you mean for the Bukkit Server, then no, but there is a really good flight mod packed into this one called "AdminCMD". The dev is trying to make it more like the single player flight mods. His fight mod may bring noclip with it in the future.
You can either use mob eggs, single player commands, or GUI Spawner Mod.
There is no cider in Minecraft unless you have a mod.