Wow, I really, really like it. Provide options to open (upload), save and 'export as html' (with embedded CSS or at least a proper link to a stylesheet hosted somewhere) and I think you have a winner.

You'd be on par with tools like 'Marked', that have the annoying habit of being Lion+ apps for no apparent good reason.

Edit: BTW, I think you are doing your app a diservice by calling it "Github Markup preview". It's actually way more than that.

Thank you! Good ideas, I will think about it.

I've been writing a README file for GitHub lately and I found out that there is no markup preview for *.rdoc files. So I've made this one. It supports most popular markups and looks the same as on github. I would appreciate any feedback or advices.

I think it would be cool if it hits google top 10 for a query like 'github markup preview'. Please share this link so people can find it quickly. Thank You!

I like it. I was looking already for something like that. That is really a use full tool.

Thank you for a feedback. Yeah, I was looking too, and there are several alternatives, but they all are not so useful and only support one or two markups.

Github own Gollum [1] maybe?

[1]:https://github.com/github/gollum/

Very useful tool, didn't know about it. Thank you. But it is a little bit complex. I mean, if I am writing a brief description for my repo, I would google for something where I can do it instantly, I don't want to install any gems.