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SeedQueue lets you reset multiple instances at once on its highly configurable wall screen. It will also generate new worlds in the background while you are playing.
SpeedRunIGT tracks your in-game time as you play and logs all your run statistics. You can customize it to look however you like.
World Preview allows you to see the world as you load into it, and reset at any point during loading.
You can set the difficulty and seed to automatically reset upon leaving a world with Atum.

SpeedrunPack - сборка модов для спидраннинга в Minecraft, включающая все верифицируемые моды с speedrun.com. Оптимизация FPS, быстрая генерация миров и инструменты для рекордов.