HoneyBook - Business management reinvented.
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.
Harlow - Harlow helps freelancers get organized, save time, and look professional with automated invoicing, proposal templates, and much more—all from one centralized hub.
Standard Notes - A safe place for your notes, thoughts, and life's work
Kosmo - Kosmo helps you automate your freelancing business. Including sending invoices, tracking time, managing projects and more.
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.