FileInvite - Stop chasing your clients for documents! Easily request files, documents, forms & signatures from your clients – set a due date and save hours as your requests are returned to you effortlessly.
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.
Clinked - White-label Client and Team Workspace
OneNote - Get the OneNote app for free on your tablet, phone, and computer, so you can capture your ideas and to-do lists in one place wherever you are. Or try OneNote with Office for free.
iDeals Virtual Data Room - iDeals Virtual Data Room is a tool that provides secure access to large amount of confidential documents and can view, analyze and collaborate in a protected environment.
Standard Notes - A safe place for your notes, thoughts, and life's work