See also: Item Randomizer for general info.
VARIA Item and Area Randomizer by theonlydude and ouichegeante
(Very Adaptive Randomizer of Items and Areas : creates seeds with customizable difficulty presets, accessible to all skill levels. Can randomize transitions between areas. The solver part estimates difficulty and optionally creates spoiler paths for all existing item randomizers.) Can create "plandomizer"/"plando" ROMs too.
Item Randomizer by total, foosda and Leodox
Adaptation of Dessyreqt's randomizer that features major/minor item pool separation and more difficulty settings (including Tournament and Full Randomization). Also removes many potential softlocks and makes some minor changes to gameplay.
Arcade by Lioran and total
Room randomizer that locks the door behind you when you enter. Seeds, goals, and difficulty are selected with the in-game menu and allow for endless randomization of rooms. Score is tracked in the HUD for completing rooms, defeating enemies, and finding secret achievements. Submit your high scores at https://arcade.supermetroid.run/
DASH Randomizer by Kipp and Smiley
The DASH (Diversity and Selective Haste) Super Metroid Randomizer focuses on providing more options for runners to complete seeds by providing new functionality to Bombs, Spazer Beam, Gravity Suit, and Charge Beam. This randomizer seeks to open up Super Metroid even more by limiting the gating potential of certain items and item locations. No generating seeds in the browser, but by the same taken, can generate seeds offline. Adapted from total's item randomizer.
Multiworld is an online cooperative game mode where multiple players play at the same time and items in one player's game can be found in one of the other players' games. By finding items for each other, you will eventually be able to all complete the game.
Item Randomizer by Dessyreqt
Downloadable, old-school item randomizer with very few changes outside of moving items. Offers Casual, Speedrunner, and Masochist difficulties. Players are required to keep their wits about them to avoid predictable softlocks. No generating seeds in the browser, but by the same taken, can generate seeds offline.
Route Randomizer by Lioran
Generates a path through random rooms in a logical order. Features many customization settings to control difficulty and amount of exploration required. Minor room edits to prevent softlocks and allow travel in multiple directions.
Randomizes each door to create a highly randomized experience which may or may not be completable. Features options to customize how doors are shuffled, item randomization, and whether to allow backtracking. Check the Door Randomizer page for help getting started.