Tools for Founders

Lawyers:

MME (Tezos, Status, Golem)
Wardynski (Golem)
Novar Rutar Law Firm (Aragon)
Gibraltar Lawyers (Gnosis)

Legal Documents:

A Simple Agreement for Future Tokens

Communication:

Slack: Easiest to setup, most popular and used, but has limits. It also gets very expensive, very fast.
RocketChat: Second most popular and open-sourced alternative.
Gitter: Used by the dev teams of many crypto projects.
Discord: Video game focussed, but offers much more granular control of permissions and roles. Also has very nice voice servers included.
Mailchimp: Free for first 2000 mass-emails.
Skype

Document Management:

Google Drive
Quip
Airtable
Github

Social Media Management:

Hootsuite: Handles all social media.
Buffer: More concise tool than Hootsuite, includes LinkedIn out of the box.
TweetDeck: Twitter management, scheduled tweets.

Project Management:

Mymeetingtime.com: Super simple timezone conversions.
Trello
Zenhub
Clubhouse
Idonethat.com
Timezone.io
Confluence  

Design:

Invision
Figma
UXPin