WPSiteSync is just want it does , yes sync you blog post on WordPress with other WordPress site, you can choose single post to sync with a one click within WordPress.
The Basic version is FREE to down load and use and it limited to number of features which are as follows;
- Blog Post Sync
- Page Sync
- Featured Image Sync
- PDF Sync
- Taxonomy Sync
When you upgrade or buy the full version you get some manny new feature which maybe easy for you to click here and see what extra you get for you cash.
Let me show you how it works: