For the times I need this type of tool, I sometimes reach for repomix[0]. It does have a webpage[1], although I've never used it.
It supports XML, Markdown, and plain text. XML is the default, and I've found it to perform well, but it might be a good tool to test differences for yourself.
If you're looking for an alternative to repoprompt, I'd recommend checking out Aider's copy-paste mode[2].