To clear a misunderstanding: RoboHelp does publish to HTML, but RoboHelp is not a dedicated HTML editor. The RoboHelp source files are indeed not ready for a website. You can generate loose HTML files from RoboHelp that may suit your need. The table of contents, index and glossary are then generated as simple XML files. (Use an XML output SSL to generate XHTML files.)
Whether RoboHelp is the right tool for you, is something only you can decide. RoboHelp is not focused on being a HTML editor. It's a HAT tool with many options focused on creating help, such as variables, snippets, review workflow, easy table of contents creation, etc. Of course you can manually edit the HTML of the topics, but RoboHelp is designed so you don't have to if you don't want that.
If you don't want any of these features, a free product like Notepad++ might be your best choice. Hope that this clarifies. Feel free to post back with any questions.
Thank you for your reply. I created a project consisting of 4 topics in the ToC (no books) and published to "XML Output". The ouput folder contains the loose html files along with an image folder (for the images I inserted in the topics). Each html topic opens fine in IE 8.