A couple favorites include the worldSpace and screenSpace tools - along with the rest I believe they will make as great an addition to your toolset as they have for me!

These tools will make you look like you know what you're doing!

The underlying code is clean and well thought out, which makes the toolkit's functionality a breeze to integrate into your setup.

Screen Space Tool makes object tracking absolutely easy. Highly recommended for Tracking! 

whisKey toolkit is an indispensable collection of slick tools that consistently saves time and headaches, I highly recommend it to anyone.

eblabs tools are great for animation. The motion trail tool is the best I've found. It's fast and efficient allowing for a much quicker workflow. I'd highly recommend it.

eblabs suite of tools are invaluable to my work flow, I bring them with me where ever I go! Thank you Eric!

The ScreenSpace tool has saved a ton of time with dynamic object tracks & roto animation. The team here uses it religiously! 

whisKEY is a must have tool for character animation at the blocking stage!