What is the best server management software?

I am looking forward to self-host a server, but since I don't want to spend my time swapping around mod files, looking in the player files and more I want to use a server management tool that does this for me. What is the best software I can use for a small SMP with friends (10 players)? The gui should have (preferably): - Easy mod downloading/updating - A way to manage the server files, or (for example) player inventories, with a nice GUI - Giving others access to the control panel (this would be really ni