Video: Evernote vs Slack

Evernote is a suite of software and services designed for notetaking and archiving. Evernote supports a number of operating system platforms (including Microsoft Windows, Mac OS X, Android, iOS and WebOS), and also offers online synchronization and backup services. Evernote open-source self-hosted alternatives are: Paperwork, Laverna, Permanote
Slack brings all your communication together in one place. It's real-time messaging, archiving and search for modern teams. Create open channels for the projects, groups and topics that the whole team shares. Slack searches whole conversations, not just individual messages, so you can find what you’re looking for no matter who said what or when they said it. Slack free open-source (self-hosted) alternatives are: Mattermost, Rocket.Chat, Zulip
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2017 - Evernote integrates with Slack

Evernote built a new integration with the highly popular messaging app Slack. Evernote is where you keep all your ideas, and Slack connects your ideas to other people. By removing the friction between these two tools, you can now spend less time searching and more time doing. By using the /note command in Slack you can jot down your notes, create a to-do list or a reminder—all without leaving the conversation. Or you can use the /clip command to capture messages from Slack and save them (based on date, importance, or URL) as a note in Evernote. With the /find command you can now search for the specific note you need and share a snapshot with the team without leaving Slack.