There are 4 to choose from:

Dire
Radiant
Diretide
Winter

Installation instructions on the page. Just download, exit Steam, install, run Steam. =)

I found us the console commands to customize the crosshair to your liking.

to enable console go to setting -> Game Options -> Enabled Console

to access console use the ~ (tilde) key.

Cross Hair Commands:

• crosshair "1" //Display crosshair (1=enabled, 0=disabled)
  
• cl_crosshairstyle "1" //Crosshair style (1=csgo, 2=classic static cs, 3=classic dynamic cs)
  
• cl_crosshairusealpha "1" //Alpha on your crosshair (1=enabled, 0=disabled)
  
• cl_crosshairalpha "200" //Alpha setting between 0-200 (0=transparent, 200=solid) - to work cl_crosshairusealpha "1"
  
  
• cl_crosshaircolor "0" //Crosshair colour override (1=enabled, 0=disabled) - to work cl_crosshairstyle "2" or "3"
  
• cl_crosshaircolor_b "0"//Amount of blue colour in your cross - to work cl_crosshaircolor "0"
  
• cl_crosshaircolor_g "250" //Amount of green colour in your cross - to work cl_crosshaircolor "0"
  
• cl_crosshaircolor_r "0" //Amount of red colour in your cross - to work cl_crosshaircolor "0"
  
  
  
• cl_crosshairgap "0" //Increases the gap between crosshair and centre point
  
• cl_scalecrosshair "1"
  
• cl_crosshairscale "1"
  
• cl_crosshairsize "5" //Increases the size of your crosshair
  
• cl_crosshairthickness "1" //Increases the thickness of your crosshair
  
  
• cl_crosshairdot "0" //Dot in the centre of your crosshair (1=enabled, 0=disabled)
  
• cl_fixedcrosshairgap "3"
  
• cl_observercrosshair "0" //Observer crosshair (removes the recoil scaling effects) (1=enabled, 0=disabled)

To Disable the kill cam ♥♥♥♥, enter the following:
cl_disablefreezecam 1