Setting Up Minecraft Night (Servers)?

My situation is that at my college we have game nights, were we usually just play steam games and such. This game night we wanted to play minecraft. My question is, how can I set up a server that allows people who don't have minecraft to play? There's about 7 of us who have accounts. Any Ideas?

p.s Were all playing in the same rooms in one of our computer labs.

What's a easy why to make a popular minecraft server?

I've been trying to make a Minecraft server with multiple worlds but its very hard, I use bukkit. I have 3 faction worlds that all need different faction towns/data and can't figure that out, as well as the money for each world needs to be different (still can't figure it out) Any ideas?

Added (1). I guess the question is more 'How do I make a multi-world Bukkit minecraft server'

Added (2). it came very easy to me to make a survival no pvp and creative server with multiple worlds are killing me

1.8 semi vanilla minecraft server?

Looking for a small semi vanilla minecraft server with a nice community and nice staff. Not many plugins and only commands such as home, spawn, and tpa. I'm not looking for any other type of server only this please.

Looking for a small minecraft server? - 1

I'm looking for an awesome minecraft server with a great community. I can hold asministrative positions of needed. Just looking for some fun in survival/creative

I can't join this server?

I'm trying to join my friends minecraft server, it either says it's full (because it thinks I'm still in the server) Spawns me inside a rock underground, or says I'm dead and doesn't let me respawn and I don't have my 3D part of my skin on my head Incase thats important, and everthing is frozen exept me, I can just walk around and nothing moves and nothings happens.(When I mine out of rock)