Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Elegantt for Trello - The most elegant way to manage your Trello projects
Sheets by Google - Excel powered with automation and collaboration features.
Hello Epics for Trello - Simplify your Trello board with parent/child relationships
NocoDB - The Open Source Airtable alternative
TunnelVision - See your next Trello tasks every time you open a browser tab