Here are the Unoffical versions of old Too Many Items mod to make it working on Legacy Fabric. There are TMI for LF 1.3.2, 1.4.6-1.4.7, 1.5.X, 1.6.X, 1.7.10, 1.8-1.8.1 and TMI using mixin for 1.8.2-1.8.9 and 15w14a, and 1.10.2 Test build based on wotblitz@minecraftforum(@RedCDev)'s base edit client.

see https://github.com/HowardZHY/TooManyItems for 1.8.8/9 Forge one and more info

1. Install Fabric Loader (For 1.3.2-1.8.1 Legacy Versions)
2. Launch Legacy Fabric, there'll be a .fabric folder, then exit the game
3. Drag the files in the zip into .fabric\remappedJars\minecraft-1.8.9-0.14.9(or other version)\client-intermediary.jar
4. Put TMILegacyFabricLoader.jar in mods folder
5. Launch and Enjoy

(For latest 1.8.2-1.8.9/15w14a and 1.10.2 test build)

2. Put the mod jar in mods folder and just launch Legacy Fabric.

Known Bugs: was Fixed.

HowardZHY made this creation BUT it belongs to Marglyph:

Original Post: https://www.minecraftforum.net/forums/mapping-and-modding-java-edition/minecraft-mods/1272385-toomanyitems-the-inventory-editor-and-more-1-8

"Copyright 2011-2014 Marglyph. Free for personal or educational use only. Do not redistribute TooManyItems, including in mod packs, and do not use TooManyItems' source code or graphics in your own mods."

The resources here is for personal or educational use only, as the Copyright is still belongs to Marglyph without further disagreement.