Client Tweaks helps you tweak some functions in Minecraft, so as to improve your gameplay experience. The changes are simple and minimal, but these are actually the things that leads to more quality gameplay. Here's a list of some of my favourite features :

Hide Offhand Item : This does exactly what it's name suggets. You can hide the item in your offhand so that it won't affect you visuals.
Auto Climb Ladder : This feature lets you climb ladders without having to hold down any key. All you have to do is to look up.
Do Not Use Last Torch : This feature makes it so that the last torch in your offhand is not placeable. This is useful if you use OptiFine's dynamic lights feature.

And there's more features that improves your quality of gameplay. Download this mod using one of the links given below to try it out for yourself.

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Client Tweaks Mod