Nidiform

“Food gives Goo
Materials give Ooze
Apparel gives Slime
Familiars give Muck
Others give Sludge”

COLISEUM
How to Train Your Dragon, by Duke, by Culex.
This is another one that's down to personal preference. There are SO MANY coli builds out there, but this is the first one I ever used, and I've never changed. It works well in the Mire and GR with two trainers and one fodder, and it is great with the addition of a mage in the Kelp Beds and GW. I train to level 7, level 9 with XP bonuses and when grinding for fest currency, and to level 6 for dom battles when numbers matter more than cash.
Maybe someday I'll get a dedicated GW team, or a 2 fodder trainer, seperate from my current pair of trainers. But for now, 3 Culex builds, 1 mage and 2 warriors, have been serving me well for over two years.

How to Breed and Exalt Fodder, by myheartyoung
A nice setup for breeding fodder. Easy to alter, too, since I don't have tons of lair space, time, and food, so I only plan to have 3 or 6 pairs when I commit to implementing this. I'd never be able to manage 15 pairs worth of fodder...

(List)Coli Builds 2.0, by JuliusCaesar
Another masterlist, this one is a nice, compiled list of coli builds. It's a pretty comprehensive list, and includes every build I've ever heard of plus more. It also organizes them really well.

BIO
BBCode, by aisumoka.
BBCode is great for adding a bit of flair to forum posts and spicing up dragon bios outside of the templates. I used it on this forum post to figure out the links! It's nice and easy to understand and copy/paste what I need.

Dragon Bio Resources: Comprehensive, by sgkat.
I like to write lore whenever I can find the motivation(almost never), and this is great for making things look really nice past the usual BBCode!

Co's Codes, by Coexistence.
Another source of dragon bio setups! I only found this one recently, and I plan to put these on a lot of my dragons! When I remember to write lore. Someday...

Free Dragon Bio Generator, by Worship.
9 times out of ten, when I get a nice dragon, I don't know what to do with them. This resource comes up with a quick sentence including a role and a couple fun traits for a dragon! This is nice for thematic outfits and getting a base idea for lore.

HOARD
Swipp/Baldwin/Den: Items to Keep, by squidragon.
When I go through my hoard once a week, I always have this list open. It's an essential guide, and is one of the most useful resources I use.

Gathering & Grinding for Swipp/Baldwin, by Piney.
I've been working at unlocking my Hibden slots, and I'm pretty much done with gathering for the den, mostly coli stuff left. So, now, I use this list to figure out where to gather based on what I need. The grinding part is helpful, too, just not much for me.

Swipp Swap Pinglist, by OverTheWolf.
Not only is it a pinglist for Swipp trades so I don't have to check for the trades I can make, but it also has a visual guide for all the trades. Sadly, I can't seem to find such a comprehensive guide for the HD and Baldwin that are both frequently updated, have all the item locations, and is visual and easy to navigate.

Yet Another Familiar Tracking Tool, by Goldia.
There's so many familiar trackers out there, so this one is just personal preference. I don't track bonding levels besides unbonded, bonded, or awakened, and I only check off familiars when I go through my hoard. It's nice, since I don't have to track everything, but I can if I want to.

Hibernal Den Quest Tracker, created by Skrymer, posted by Goldia.
Thank you Goldia for posting this on this thread! It's surprisingly low-maintenance for how comprehensive it is. I've had some trouble myself with tracking what items go with what tasks, and this works perfectly. Thank you!

MONEYMAKING
[Guide] Glimmer & Gloom All Solutions, by chatoyant.
Absolutely essential! While I don't need to actively use this guide, since I have the three patterns for hard mode memorized, it's incredible. I can max out fairgrounds in about 10-15 minutes. It's amazing how fast the money comes in.

The Data-Based Money Making Guide, by Paladingineer.
This guide is for other, smaller money-making methods. For example, it taught me to never hoardsell food that I keep getting more of so I can sell the stacks on the AH, and how to maximize funds in the Trading Post and get a bit of extra cash from bonding with awakened familiars(which I don't usually do) and playing Higher or Lower.

EVENTS
Festival Coliseum Guide(Archive), by Maki
This is the Archive, but every festival Maki's guide is typically on the front page of the Forums. They're linked somewhere in the Archive, I think. It's a great guide on where to grind for the best stuff, and how to balance drops and XP. It even has the microholidays, which I didn't even know had different rates.

Prepare and Survive NOTN, by MidnightLady05.
Now that NOTN is coming up, I remembered that I have no idea what I'm doing and need something to reference all the time. "Coming up" is a strong word, but I like to plan EARLY, otherwise it'll sneak up on me. I plan in September or I panic-plan in mid-December ADHD gang rise up. God, this guide is amazing. It has everything, from preparation to day-to-day, and it works for anyone!

APPAREL
Eclipse's Apparel Catalog, by EclipseDragon.
Nice for collecting and creating outfits where I have a vibe, but not an idea of what to search in the Dressing Room. Saves a lot of time of scrolling through pages and pages in the Dressing Room.

Coliseum Venue Apparel Sets, by coronalis.
It's just nice to know what apparel comes from the coli. When I go through my apparel, I check this list for the venues I've been grinding in lately so I don't reduce any rare apparel.

OTHER
Masterpost of Guides, Tools, Resources, etc., by Nesu.
I only found this recently, and added a whole bunch of stuff from it onto this. If I need anything and it isn't bookmarked for me here, it's on this masterpost. It doesn't have everything, but it has as close as you can get to everything.

Vista Collector's Spreadsheet, by Tserin.
I didn't really care much for vista collection before the lair update. I had like, three combinations, and I was fine with that. Now, I would love to have vistas that match all my dragons, and that's not that hard to keep track of, but it can always be easier.