Searching for cases in their original form and tips on case compilation/information tracking

[NotSHolmes]

TL;DR What tools/methods do detectives employ to keep track of so much information in an orderly and referential fashion and how can I imitate that with the cases I'm following?

I've been following a few cases for some time now and have come across a slew of information on some (internet/book sources, relationships, genealogies, tips, clues, timelines, ect.) and I haven't yet found a good way to structure the information in a suitable way such that I can refer back to it at any point and easily find something I'm looking for. Currently I am simply collecting links/information into text files, but usually within a few edits I have way too much to keep track of in an unsorted mess.

That got me thinking; surely there must be professional tools/methods used by detectives in order to keep their cases orderly and structured. I'd appreciate it if anyone could refer to me some real cases that have been released to the public in their original form, or at least shine a light on some of the methods. I understand that much of it may be acquired knowledge, so I'm also interested to know your personal methods that you employ when collecting and sorting such information.

Sorry for so many questions - please feel free to answer as few (no - not none) or as many of them as you like.

Thank you in advance!

Edit: I found this (seemingly professional) tool a while back, which seems to solve a part of my problem (just the genealogies/relationships), and just rediscovered the link: How to map connections between individuals, companies and more with VIS

 

[themissingandthelost]

I'm really boring and use an Excel document for keeping track of where I am, who I have contacted, when, how much time has passed, and if I need to send a gentle reminder. I also keep an Excel doc by case with reference sources. My notes are all in a notebook with post-it dividers. I could do with some tips, too. I found your link very interesting so thank you for sharing.

 

[NotSHolmes]

This is what I came up with after some thought:
The Springfield Three - New Discussion
It isn't perfect, but it is very helpful.

 

[themissingandthelost]

Oh this is brilliant, thank you!