Tools For Aiding In Creating Puzzles

I was hoping some of the fine folks on this forum might share some tools that one can use to create puzzles.  I saw a posting about a maze generator (which is sweet!) I’m using both LibreOffice Write and LibreOffice Draw to aid in creating puzzles but I was curious if there other purpose built sorts of tools to aid in creating puzzles.  I haven’t Googled it yet but I’d be very surprised if there weren’t tools to help in creating crossword puzzles.  I hacked together a small tool to create a “puzzle” of my own invention called a word box but I’m not sure it’s all that interesting.