This is a collection of various, mostly unrelated, sourcemod plugins. Most are for CS:GO. Some may be labelled as for CS:GO, but work more generally.
Sourcemod 1.7 or later. Plugins are currently intended to be compiled using the 1.7.2 compiler
You may find some compiled versions of the plugins at http://dl.whiffcity.com/plugins/sm-misc. The only file you need to downloads is the .smx file.
There are also continuous builds available for the plugins. These will be more recent than the plugin versions at http://dl.whiffcity.com/plugins/sm-misc.
Installation instructions vary by plugin. For most, you only need to move the plugin binary (the .smx file) into addons/sourcemod/plugins and you will be good to go. Some plugins may have cvars, and some might create a config file to set those cvars when the plugin first starts. Generally, those will be in cfg/sourcemod/<plugin_name>.cfg.
TODO.
For now, you can can find some descriptions in the source code for the plugins, in the description field.