If you are using Adminmod on your server, then you can find most plugins for it at the following link. You can scroll through them to find the plugin that fits your description:
HALF-LIFE Admin Mod
Fast map downloads is not a plugin. You have to have your own webspace in order to make it work and add a variable to your server.cfg file. You can find out more about fast map download at the link below:
Counter-Strike.com - Your Counter-Strike Source for Counter-Strike 1.6, CS:Source, Condition Zero, and more.