Absent by Design Mod (1.20.1, 1.19.4) - New Fences, Walls, Stairs, and Slabs - 9Minecraft.Net
Colorful Blocks 1.18.2 [Forge] Minecraft Mod
More Concrete - Minecraft Mods - CurseForge
Vanilla Things Mod 1.16.5, 1.15.2 (More Decoration Choices) - 9Minecraft.Net
Moar Stairs! Minecraft Mod
Sweet Concrete - Minecraft Mods - CurseForge
Concrete Slabs | Minecraft PE Mods & Addons
New Slab, Stairs and Walls - Minecraft Mod
Pl3xStairs - Minecraft Mods - CurseForge
LogicalGeekBoy on Twitter: "A first step in writing my own mod. I'm sure it's been done but this could open up a bunch of possibilities! As a first project I'm going to
Concrete and Terracotta having Slabs, Stairs, and Walls – Minecraft Feedback
More Stairs and Slabs Add-on 1.16+ | Minecraft PE Addons
More Concrete - Minecraft Mods - CurseForge
Ana's BuildingBlocks: ConcretePlus Minecraft Mod
Concrete Slabs and Stairs | MCreator
New Slab, Stairs and Walls - Minecraft Mod
Sweet Concrete - Minecraft Mods - CurseForge
GitHub - RahalaBytes/SweetConcrete: A Minecraft mod adding concrete variations of existing vanilla blocks (slabs, stairs, etc.)