For about a decade, I've maintained a skill tracker website where you can enter your KoL user name or paste in your skills list from your profile to compare your list of skills to the KoL Wiki's Hardcore Skills Analysis page.
As most of us know, that page has fallen pretty badly out of date, so a new data source has recently been implemented using the Ascension Speed Show's spreadsheet, and now there's a KoLMafia script for populating it in a much more efficient way than before.
This script works similarly to the snapshot scripts (Run and get a link to a web site), but it allows you to see your permed skills in a tiered structure so you can make intelligent decisions about which skills to perm next.
The script is maintained on GitHub ( https://github.com/plasticlobster/kol-skills ).
You can install it by typing:
At the end of script execution, it will give you a URL you can go to which will show your permed skills in a tiered manner. There's an optional link within that page to look at the KoL Wiki Hardcore Skills Analysis version of the tiers as well.
svn checkout https://github.com/plasticlobster/kol-skills/branches/Release
You do not have to be in aftercore in order to run this script, and it will detect invisible skills like Summon Lovebugs as well.
EDIT: See comments #2 and #3 below - Best advice is to run this in aftercore because it might not find your Tomes/Librams and skills like Perfect Freeze if you're in a standard run.
If you have any issues or suggestions, please open an issue on GitHub or Kmail PlasitcLobster (#1919839).
Update March 19, 2019:
The site has been redesigned from the ground up. Should be mobile-friendly now in case you want to have it open on your phone while you're making your decision on your computer.
It now keeps track of the KoL user who submitted it and gives you two links when you run it... One will take you to the latest run for your user, the other will be a direct link to that specific run.