X-Ray is built in — it's the XRay module under Render, no script needed. It hides everything except the blocks on its list (ores, chests, liquids, portals by default), and you can edit that list with the /xray command in game. See the XRay docs. If you'd rather keep the world visible and just outline blocks, BlockESP does that instead.
There's no seed cracker in LiquidBounce. The closest thing is StrongholdFinder, which triangulates a stronghold from ender eye throws — that's stronghold location only, not seed reversing.
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