Hi Karthik, I think you need to knock the online 'file conversion functions' together and mount them in a Mobirise template if you don't want to turn these names into an art project. Apply some basic DIY SEO. This method shows you have functioning examples of each domain on display to entice any potential end users to say to themselves that "this is feasible, it just needs a marketing budget".
The only reason I have a dozen domain names registered with CrazyDomains.com.au is because when they launched they had advertising placement EVERYWHERE, seriously.
As these names stand, undeveloped, you may happen across an entrepreneur who has a vision based around converting HTML into PDF or whatever the case may be and he may have $500 set aside for a name he simply cannot hand-reg for a tenner.