As suggested by the title, this is a collection of many different workshop items I have found that provide additional fixes and improvements to HL2 and its episodes with minimal performance impacts. I do not own any of these addons, if you are the creator of any of these addons and you'd like me to remove them for any reason, please discuss that with me through the comments section or a DM.

This collection includes "slight touchup" addons that do minor changes to game assets such as fixing UV issues to in-game models like Kleiner and the HEV Suit, animation fixes to models like the crowbar, the shotgun and more. The collection also includes other touchups including:

• Adding in/fixing missing or broken assets like the addition of the light bridge sounds and properties from Portal 2, the Advisor sequences in EP2 and more.
  
• Improvements to gamplay mechanics or tech such as bringing back the original ragdoll physics that were altered in future updates, increasing the FOV of the flashlight so it has a wider range it can light up, etc.
  
• Sound remasters such as replacing some of the Metrocop voicelines that have inconsistencies with their voice filter.
  
• And many more

This collection has been set to allow you to subscribe to any of these addons and not all of them, so you can tailor your experience to how you want it, if you want to use HL2:MMOD weapon models and sounds, then you can choose every addon except for weapon fixes since that would conflict with your addon of choice.
That being said some addons included in the collection have alternative versions that conflict with one another so you need to choose which one you'd like to have over the other, an example being the 2 zombie addons 'Zombie Animation Improvements' and 'classic zombie model fixes' where you need to choose between having better looking models or better looking animations. The footstep addons also have this same thing, you have to choose between having touched up versions of the original HL2 footstep sounds or having them replaced with high quality versions of the footstep sounds from HL1.