LootWhatIWant

LootWhatIWant puts you in charge of what loot you want to loot. 

Allows blacklists, and just letting the item sit on the corpse/loot window without looting, or looting and with hardware interaction (automates but popup window with item being delete) deletes item from bag. 
If you delete something though, it's gone, so use with caution, but with hardware event and what item it's deleting you are giving a reminder.

Has keep lists for grey items you dont' want to be vendored.

And finally sell list, add any item to the list, grey items are automatically counted, no need to add them.  
Items can be added to all 3 lists through command lines, or ctrl/alt and clicks (see in game UI for specifics).

Adds a button at top of vendor window to click to sell all grey/sell list items.  Keeps track of total gold made from sell list, and gold lost due to destroyed from LDB Plugin.  If you have an LDB bar, it will have an entry showing total sell list value in bags, total slots free along with total slots, if you hover over the LDB plugin, it will list all items, and if you shift click the LDB plugin it will drop(delete) the lowest value item, but you can also shift click an item in the list to drop it even if not the lowest value.

LWIW commands (bare /lwiw opens the options panel):
    help -- Show this list of commands.
    autolootoff -- Turn off WoW's own Auto Loot setting (required for LootWhatIWant to work).
    resetstats -- Reset the gold-earned and gold-lost totals to 0.
    add -- Add an item to your blacklist (shift-click the item link after the command).
    remove -- Remove an item from your blacklist.
    keep -- Add an item to your keep list (never auto-sold).
    remkeep -- Remove an item from your keep list.
    sell -- Add an item to your always-sell list.
    remsell -- Remove an item from your always-sell list.
    cleanup -- Scan your bags now and queue any blacklisted items for destruction.
    profile -- Manage cross-character list sharing: /lwiw profile [save|load <name>|list]

Just a notice about AI:

I've had to re-write this addon from the ground up (I did use AI help as I'm busy, and major changes since even 9.0 and 10.0, that I never was able to take the time and fix before).  The addon basically still worked, I've been using it this entire time when i do play, but UI was a bit messed up, many routines were no longer needed, etc.

I did write the original back in 3.0 or 3.1 (Lich King xpac).  I've updated it throughout the years (check the changelog), but since like 23/24, I just stopped outside my personal use.  I verified my code was fully functional besides some XML warnings, and uploaded it to AI to help make more efficient and generate some better UI buttons.  Most of the work is still mine though.

That said, I did try to keep all variables the same, so any lists you've been cultivating over the years like me, aren't lost.