Imperium Sanctus
Final Fantasy XIV: Resources
Ariyala's Toolkit is great for comparing gear, searching for all the available gear at any given ilvl range in order to decide BiS (Best in slot) for any class. A very useful URL generator lets you share your selections with others quickly and easily. It's also the leading website to report A and S ranks to: if you kill a hunt, report it here so that everyone has the respawn timer. Finally, it has a timer for unspoiled nodes, and again your selection of timers to keep track of can easily be shared with the URL generator.
Garland tools offers 3 components. Garland Data is great for organizing and keeping track of a lot of stuff at the same time, especially when it comes to crafters and gatherers. It has a complex, highly customizable interface so you can put all you need in a list or in a page and keep track of it. Unlike Ariyala's, it's less focused on gear, it has an entry for almost everything in the game, from patch notes, to achievements, to every limit break, weather, basically everything you can think of. Garland Bells is a timer for (mostly) gatherers, and FFXIV Fisheris your go-to resource for fishing, with timers, weathers and baits.
Assistance with those pesky ARR Sightseeing vistas. Timers included and will notify you how long you have or until it comes up!
The Chocobo Colour Calculator can guide you through the obscure process of dyeing your chocobo. These tools deal with the randomness involved in different ways: the calculator tries to get you approximately to where you want to be, and then make tweaks afterwards, whereas the chart suggests you do it one step at a time. Either way, follow the instructions very carefully, maybe do some background reading (follow the links on the calculator page,) and you should soon be able to get the white/pink/green/purple steed you've always dreamed of.
Gardening is for gardening! :D It includes a very useful planner with growth times, where to plan the seeds for best results, and all the info you need.
Crafting as a Service is a great resource for crafters and gatherers. It can be used in a variety of way, from helping you gear up at any given level, to organizing your activities in order to make one of every item you can make, or simply finding the best way to level up and/or make money. It's extremely versatile and powerful, once you get the hang of how to use the site.
Crafting Optimizer is another great tool. It helps find the ideal, most reliable rotation given your level and stats. It also simulates various scenarios and rotations.
Cat Became Hungry is a great resource for fishing! Lists baits, locations, fishes, weather, collectables, desynth results and pretty much everything you can think of.
Great for Housing ideas or projects you are working on!
FFXIV Squadron calculates and shows the optimal training units and Team set up for Missions based on your Squads stats and chemistry.