Appsumo https://appsumo.com/ has many Black Friday lifetime offers, most of which are unrelated to what we usually discuss in this forum. Two which may be of interest are:

- Clinked https://appsumo.com/products/clinked/ is a collaboration workspace which I have used in projects and found quite intuitive
- Spreadsimple https://appsumo.com/products/spreadsimple/ is for quickly creating and managing catalog websites using Google Sheets