Ex Nihilo

Ex Nihilo is a mod developed with Skyblocks in mind. It is created by Erasmus_Crowley, and adds numerous items and blocks that allow you to obtain materials not normally obtainable in skyblock. It allows you to obtain string via Crooks and Silkworms, ores and various dusts by Sieves, water by Barrels, and numerous other resources via numerous other devices.

Although, by default, it adds compatibility for many mods, an addon mod, Ex Aliquo, adds integration for several more mods that are not integrated by default with Ex Nihilo.