Resource to do "clue mapping"

Hello! I was wondering if anyone knows the best resource to create the kind of "clue maps" you see in detective shows with the arrows and all. I'm approaching the end-game (I think). I'm on night 43, I got to room 46 a while ago and I'm uncovering the >!political/historical aspect, chess, 8 keys, etc.!< . I've been screenshotting as much as I can and I'd love to have a way of linking things, grouping screenshots, writing theories, text, etc. I've got everything on my PC but if there's something for android tablets (Galaxy) that'd be even better. Thanks!