Abstract is really good for version control and connects to sketch. It is based on branch systems that derive from master files. This means that multiple people can collaborate and work across different parts of a project and keep versioning in check.

https://www.goabstract.com/how-it-works/

Never used Illustrator for UI work because the workspace doesn't lend itself well to digital design projects such as responsive websites and mobile apps.

Photoshop was my primary UI tool until about 2015. Ever since then I've solely been using Sketch for UI work and I haven't looked back since.

I mostly use Illustrator for logos, illustration and patterns.

I left straight away. You're asking me for my email in order to find out more about a product I know nothing about. I have no idea what I'll be getting in exchange for my information.

Also not sure why each footer link opens up separate tabs? You're sending me away from your site :(