WSBIV stands for "What should be in Vanilla".
It adds some mods that adds things that should be in Vanilla.
With Aether Legacy you have the nostalgic feeling of the old Minecraft mod.
Extra Utilities 2 adds many utilities, that makes the Vanilla Game better.
With Chisels and Bits you can build detailed buildings out of pixels.
ProjectE adds machines to convert items to other items. But trust me, it is expensive!