Unlimited Chisel Works - Quark Extra by Wollis
This addon adds the limestone blocks from Quark in Unlimited Chisel Works.
Igneous by playing_w_blocks
Intended to enchance the skyblock experience by giving access to blocks other than stone - as products of new lava blocks!
GustoCraft by rainbowknight12, momnop, azxc4, RX14, RSQ
An awesome mod which attempts to blend magic and tech into a awesome experience! Thaumic Gustonia also provides a way to use GustoCraft with Thaumcraft 4.
hPermissions by HoBoS_TaCo
hPermissions is a server-side permissions mod for a Forge-modded Minecraft server.