Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Agenda - A date-focused note taking app for both planning and documenting your projects.
FriendlyData - Communicate with databases like a human
Notepin - Extremely simple note-taking + blogging ✍️
SpreadsheetDB - A database that you can query with spreadsheets
Bear - Bear.app is a note-taking and content writing app that helps you boost productivity with its intuitive tools.