I've checked out a lot of document generators, as I need to create automated reports for my clients. Most of the options out there are either crap or super expensive (one quote I got was $125 per month for about 100 docs). Crove checks all the boxes I needed, and is also pretty easy to use.
The only other app I found that is affordable and works similarly is Zoho Writer, but it is harder to learn than Crove.