Here's a free tool I made recently that might be useful for writers. The popular scriptwriting software Final Draft exports HTML, but it's 'preformatted', meaning all the line breaks and spacing are hard-coded. So, while you can insert it into a web page, it won't flow to fit different screen sizes, and tends to look terrible on mobile devices especially.
LastDraft improves on this by turning scripts into responsive HTML, which works great on all screen sizes while maintaining the look and feel of standard screenplay formatting. If you don't use Final Draft, any software that can export .fdx files should work fine too.
Check it out at: LastDraft.ink.