This extension for Fallen London adds categories of convertible items to your inventory.
This unofficial extension for Fallen London collects each tier of convertible items in your inventory into its own category for convenience. You can expand and contract each category, or hide it completely.
v.2.0 updates this extension for the redesign that launched in October 2018.
v.1.4 gives you some control over when tier and faction items are enabled or disabled. The new options are in the popup.
v. 1.3.10 adds a category for Fidgeting Writer items (which is hidden by default). You should also be able to see whether your faction items are usable for raising Renown.
v. 0.2.6 adds a category for Tier 4 items and for faction items that raise Renown/Connected. (Both can be disabled in the popup menu, of course.)