Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
Clinked - White-label Client and Team Workspace
Joplin - Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.
SuiteDash - Integrated & Automated Client Portal Software : Secure Web Based Client or Customer Login Portals : White Label SaaS Project Management System, Online CRM Tool, Browser Based Invoicing & Recurring Billing, Time Tracker, Client File Upload, , All in …
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.
Slack - A messaging app for teams who see through the Earth!