What is the most popular cross-platform ink-capturing and displaying technology?

I need to develop a simple application that allows the user to write some text and save 开发者_JS百科it in the DB. It needs to be reasonably secure.

Unfortunately... it needs to work on both Windows and Mac, desktops, tablets, and all mobiles:(

Is there any such technology?:(

Give a try to Qt - it's cross-platform, reliable and relatively easy to use.

Depending on what you want to do, an alternative would be to write a web application and let users access it with their web browser.