Useful tools
Here is a collection of tools I find useful. I once thought such tools were too expensive, and reverted to oss tools installed on servers or simple documents (text or spreadsheet).
My advice would be to spend a few bucks on a couple of tools, and use the time spared by the productivity gain on the product.
Roadmap/project/product management
Mind mapping
Agile project management
Time tracking
Roadmap/products management
Monitoring
Metrics
Status pages
Logs
Error management
Web performance
Development/Testing
Continuous integration/delivery
Translation
Documentation