I was thinking about selling it as enterprise software, but that could be changed
The thing is, who uses your software is not up to you. I’m, in a way, in the same space (I wrote https://www.sumatrapdfreader.org/). I see pdf viewer/manager as mostly used by individuals.
If you want to sell an enterprise version, you would have to figure out features that individuals don’t care but companies do.
Even then this is not the kind of software you can sell the way Oracle sells their database. Even if a company buys it, it’s still a small utility and is bought at small utility prices via one-time purchase, like all other small utilities.
Re: website. It’s an over-all impression.
I collect links to what I consider pretty websites: https://www.notion.so/nicedesign-nice-design-nice-ui-good-ui-good-design-41ac946c558c477ea3adf8a36d7617bb#0bd4f08bac4b4c8faf767732e9e655a0
When I write a landing page for an application, those are the pages I use as an inspiration.
Some common things among the “pretty” pages:
- the important links are at the top
- light colors (vs. rather grab gray)
- leading with screenshots (vs. mostly blank space)
Personally I’m not a good web designer so the way I approach web design is: find the best looking page created by a good designer and imitate it.