I'm using this account to post archival copies of old MTurk-related userscripts from userscripts-mirror.org (which is itself an archive of the defunct site userscripts.org), which their authors or others haven't re-posted on Greasyfork yet. Some of these may no longer be all that interesting as more recent scripts may do what they do better, but some remain very useful.
MTurk Worst Case Scenario CalculatorJS
Shows what your approval rate would be in worst case scenario. This version was patched by Austin3600, since the original hasn't been updated since 2012 and is broken with new dashboard.
Zing Receipt Compare ScriptJS
Allows you to press one button on Zing's "Are these two receipts the same" HITs and it'll automatically pick that option and submit for you. There will be a confirm pop-up (to avoid errors), you can quickly press Enter on your keyboard to confirm & submit.