17hats - The all-in-one business system for entrepreneurs.
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.
Bill.com - Bill.com provides ACH payments processing, automates your accounts payable and accounts receivable processes.
Standard Notes - A safe place for your notes, thoughts, and life's work
Zoho Invoice - 100% free online invoicing software for small businesses.
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.