This is a Magic: the Gathering deck editor that supports custom categories for cards in decks.
Magic: the Gathering is owned by Wizards of the Coast, to which I have no affiliation.
This depends on MTGJSON (http://www.mtgjson.com/) for its card list.
sbt: https://www.bing.com/search?PC=U523&q=sbt&pglt=299&FORM=ANNTA1- JDK 16 or newer: https://www.oracle.com/java/technologies/downloads/
From the command line, install prerequisites and then run sbt run.
On Windows, each release also has a standalone installer that doesn't require any prerequisites.