OptiFine Features*:

• Animatica by FoundationGames - Animated Textures;
• Capes by caelthecolher - Capes from OptiFine, LabyMod, MinecraftCapes, etc;
• CIT Resewn by shsupercm - Custom Item Textures;
• Colormatic by kvverti (1.18.2, 1.19.2) - Custom Colors;
• Continuity by peppercode1 - Connected Textures and Emissives;
• [EMF] Entity Model Features by Traben - Custom Entity Models;
• [ETF] Entity Texture Features by Traben - Emissive, Random & Custom Textures for entities;
• FabricSkyBoxes by AMereBagatelle - Custom SkyBoxes;
• FabricSkyBoxes Interop by FlashyReese - FabricSkyBoxes Interoperability for MCPatcher/OptiFine Skies;
• Iris Shaders by IrisShaders team - Shaderpacks;
• LambdaBetterGrass by LambdAurora (1.16.5 - 1.19.2**) - Better Grass and Snow;
• LambDynamicLights by LambdAurora - Dynamic Lights;
• OptiGUI by opekope2 - Custom Inventory GUIs;
• Polytone by MehVahdJukaar (1.20.1, 1.20.4) - Custom Colors, etc;
• Puzzle by Motschen - Custom Resourcepack Splash Screen;
• Sodium Extra by FlashyReese - Adds Extra features to the Sodium settings;
• Zoomify by isxander - Zoom.

Some not OptiFine-Features mods:

• fast-ip-ping by fallen-breath - Yeet the laggy reversed DNS lookup for pure IP server addresses;
• FastQuit by KingContaria - Lets you return to the Title Screen early while your world is still saving in the background;
• Mod Menu by TerraformersMC - Mod menu to view the list of mods and config them in-game;
• Reese's Sodium Options by FlashyReese - Alternative Options Menu for Sodium;
• YOSBR by shedaniel - Saves your settings after modpack updates.

* 1.16.5 have very decreased list of mods for OptiFine features

** 1.19.4 and higher replace LambdaBetterGrass with Fast Better Grass resource pack