Optifine - For much better performance

Light overlay texture pack - Great for finding where mobs can spawn in your area. Needs Optifine.

Xaero's Minimap

Xaero's World Map

Simple Voice Chat - Push-to-talk with other players.

Forge - You need this for Xaero's plugins.

MultiMC - A great launcher for Minecraft that simplifies installation of plugins and handles easily multiple accounts and profiles. Fioralys reported that it had issues with Microsoft accounts but it works for most of the players so it's still suggested.