Features:

this list is quite a bit outdated, many features have been added since it was created

• Enhanced BevoFlight (ONLY ENABLABLE BY STAFF)
• Edited crash menu
• Brightness slider
• Adjustable cloud height
• Footstep sound fix
• Entity distance fix and slider
• Unknown Windows version warning removal
• Chat print to console
• Significantly improved f3 menu that includes:
  • Colors!
    
  • Biome
    
  • Light level
    
  • Block ID and Metadata
    
  • Item ID and Metadata
    
  • Better facing direction (North, South, East, West)
• Information about the held item (stack size and durability)
• Adjustable zoom
• Improved pause menu that includes texture packs button and screenshots button (also fixes the saving text in multiplayer)
• Gui scale fix (no more, small, medium, and large, simply integer scales that go up to your current resolution like modern)
• Fov slider
• Significantly increased item render distance
• AMD clouds rendering fixed
• None key fix (none keys being activated on media keys)
• Screenshot bug fix (screenshotting randomly not working)
• Sign text distance culling, significantly improved fps in sign dense areas!
• Chat fade out translucency fix
• Wolves display the names of their owners in multiplayer