Realistic Craftable Gunpowder
This mod adds craftable gunpowder based on real life ratios that are actually used to make gunpowder. I tried my best to replicate the most common ratio used to prepare gunpowder as a crafting recipe (I'm not going to put the real life ratio here for obvious reasons though).
To make gunpowder, you'll need 6 Potassium, 2 Charcoal and 1 Sulfur Ore. Potassium can be crafted from Potassium Powder, which is obtained by smelting or smoking a Muddy Water Bucket, which is obtained by mixing a Water Bucket, Coarse Dirt and Wood Ashes (obtained from smoking or smelting sticks), and Sulfur Ore is found underground in elevated regions, deserts or jungles (Charcoal is obtained through vanilla methods). This recipe produces 9 gunpowder, so it could be really useful in a hurry (assuming you're near a biome that has sulfur ore on it).
The mod also adds Packed Gunpowder which is a block crafted from 9 gunpowder and explodes when activated through redstone.
And that's about it, the mod is simple and straightforward so you can use it in your modpacks, and can be useful alongside mods that require a lot of gunpowder (mainly weapon mods).