For https://keycombiner.com I am using:

Development & Project management:

- GitLab

- Notion

- Sentry

Hosting:

- PythonAnywhere (Makes hosting a django application very simple!:))

- Cloudflare (Free tier already works great for caching purposes)

Mail:

- Mailgun

Payments:

- https://paddle.com/ (to handle sales tax on top of stripe)