This web tool saved me at least an hour by drawing a complex chart with relations. Arranging linked nodes together helped me to see the structure that was hidden before.

Also worth mentioning I’ve wasted about an hour more trying to find a proper tool for the job.

Chatuml is the best since it allowes to code the relationships instead of torturing a user to click everything and drag mouse like a monkey

They also added some linguistic model to assist in writing the code. This is very helpful since I failed to find ANY reference as-per syntax of this thing

UPDATE: here is documentation abut the syntax