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

Mapping/Routing

Analytics

SEO