Modern OptiFine alternative.

Additive is a simple, modern, open-source alternative to OptiFine for the most recent versions of Minecraft. It has basically every feature from OptiFine, including:

There are also these extra features included:

For more information, read through Additive's Modrinth page.

How do I get it?

For installation and downloads, see this page. It provides instructions for third-party launchers and also an installer for the Mojang launcher.