MineTweaker isn't. You can find it in many mod packs.
MineTweakerRecipeMaker is an addon that requires MineTweaker. It doesn't do everything you're were asking for, but it does make it so you can visually see the recipes you want to make or disable. It doesn't let you add things to an oredict or create a new oredict.
They are only for 1.7.x
Making custom blocks, there is a mod called Quadrum that lets you do that. However there is still some behind the scenes coding you would have to do in the configs to make it happen. You can also make custom items, the Regrowth modpack is a good example of that.
Again it's a 1.7.10 mod