The Vegan Option

This modpack makes use of "The Vegan Option," a mod that allows you to collect the resources you normally collect from mobs, both hostile and neutral. For example, you can get wool from Kapok tufts (gained by breaking jungle tree leaves) and string made from jute (collected from ferns in taiga biomes). You can gain fertilizer (bonemeal substitute) from compost and saltpeter. Gunpowder is made from the expected materials: sulfur, saltpeter, and coal dust. Use NEI to look up mob drops to find out their recipes. If they drop from something, NEI will even fill you in on this.