what are some good mods

[Bxephos]

me and a friend are gonna play ksp together using dark multiplayer mod. what mods would you reccomend that you dont think are cheating

[DStaal]

What type of play are you looking for?  There are good mods for colonization gameplay, life support, boats, warfare, airships, realism, non-realism, exploration, heck there's even a submarine mod.  Some mods make things harder, some make things easier, and yes some outright cheat - but if you want to play a game of interstellar conquest against each other, maybe you want the warp drives so you can get to each other's solar systems in a reasonable amount of time. 

[IncongruousGoat]

To be completely honest, it depends entirely on what sort of thing you're planning, and how you build rockets, and what sorts of mission architectures you like. There are a lot of mods out there, all good and all balanced towards different sorts of end goals. The trick is to survey them all and pick the ones that best fit whatever it is you're trying to do. An objective definition of "good" is a hard thing to nail down, because basically every mod out there can be considered inappropriate for a specific situation. Well, okay, perhaps not Real Plume. But you get the point.

Sorry I can't be more concrete, but without an idea of what sort of multiplayer thing you're trying to do I can't be anything but vague without imposing my own preferences on you (which would be counterproductive).