Junk Jack has been updated a ton. If any of you haven't played in a while or weren't sure if you wanted to grab it, the thing is pretty much on par with Terraria at this point. Tons upon tons of shit to build. They've added livestock breeding (you can build several kinds of stables and breed animals by feeding them), farming (I've got an orchard full of apple, peach, pear, and lemon trees, and have a garden full of all kinds of shit... some plants need tilled soil, others even need support structures), cooking (two different stations you can build to do absolutely all kinds of recipes), gem crafting for items to add extra stats, new mobs, and a graveyard biome.
Don't bother checking the wiki, as a lot of this isn't in there yet.