Open Live Writer is like Word for your blog. Open Live Writer is a powerful, lightweight blog editor that allows you to create blog posts, add photos and videos then publish to your website. You can also compose blogs posts offline and then publish on your return. Open Live Writer works with many popular blog service providers such as WordPress, Blogger, TypePad, Moveable Type, DasBlog and many more.
I used to run a virtual machine just for Windows Live Writer, I liked it that much. The new Open Live Writer is targeting Windows 10 (with support for Windows 7 and 8 for the time being)
Unfortunately, I couldn’t figure out how to run it under Wine under OS X, so I’m going to have to install a virtual machine if I want to use it on my Macbook Pro. Looking at the FAQ, it looks like Open Live Writer uses too much of the Windows API to make an OS X or Linux version.