Which SaaS tools does your team use the most?

We're trying to integrate a bunch of SaaS tools at https://cloudsynth.com and want to know how to prioritize them. So as the title suggests which SaaS tools do you or your team use for getting work done. Things we've integrated with: - Github - Gitlab - Trello - Jira - Jenkins - CircleCI - PagerDuty - Sentry - Phabricator - Google Calendar Curious what else is popular out there. Thanks!