WordPress for Android
- Url: http://android.wordpress.org/
- WordPress for Android is an Open Source app that empowers you to write new posts, edit content, and manage comments with built-in notifications.
WordPress for iOS (Iphone, Ipad ..)
- Url: http://ios.wordpress.org/
- For all iOS app (IPhone, IPad, etc)
- Effortless Comments
- Elegant Composing
- Location Mapping
- Gorgeous Photos
- And many more…
WordPress for BlackBerry
- Url: http://blackberry.wordpress.org/
- You can write posts, upload photos and videos, edit pages, and manage comments. Both WordPress.com and self-hosted WordPress (2.7 or higher) sites are supported.
WordPress for Nokia Phone
- Url: http://nokia.wordpress.org/
- Allowing you to edit your existing blog content, add new posts and pages, or simply manage comments on the go, WordPress for Nokia allows you to do it directly from your S60 or Maemo-powered Nokia.
- Other features
- High-performance and good looks combined
- You can see your blog stats
- Share your latest pictures and videos
As WordPress is free so all above platforms are free to use.
You can blog from any platform with no worry.