What's the best tools you can use to run a remote web agency?

As a remote designer, this is a must have. I'm always contactable and available. Super easy way to also have quick calls and communicate with other team members on different teams.

I'm a part of a ton of Slack communities but I'm active in only a handful.

Slack works to its fullest only when it is implemented in a team and everyone's supposed to use it for communication. Slack could/should improve on making the communities on it better by adding relevant features.

I love everything about InVision.

Since I started using it 3-4 years ago they improved so many things and added really useful features. They collaborate with so many top designers of the industry that they always know what we want. I really appreciate the effort, time and love they put into their products and it's always fun to use them.

The tools I use on a weekly basis are:

InVision (Webapp); Freehand; Craft; Designbetter.co

All my designers loves the service, but I am struggling to use it, I find its UI/UX uncomfortable and not obvious. The most terrible is a mobile version of the web-site, extremely slow.