Build arbitrary shaped nether portals, with all the previously enabled Obsidian Block
BetterNether was migrated to BCLib which requires some updates on your world
All Nether Pickaxes have improved mining speed for Obsidian Blocks
Use a bucket of Water on a Lava-Source above Soulsand/-stone to generate blue Obsidian.
Use a Lightning Rod to create crying (or weeping) obsidian.
All Full Obsidian related Blocks can be used as a portal Frame