Joomla is a free and a great open source CMS script for creating almost any type of script, portal or business site. Though the script is free to use, but the default themes may not give you a great design site. To make a professional business site, you should use some premium paid joomla templates to give best looks to your site.
Here are our top 10 suggestions :

1. Youjoomla
2. Rocket Themes
3. Joomla Art
4. Template Plaaza
5. joomla bamboo
6. joomla Shack
7. Shape5
8. themesclub
9. iJoomla
10. JoomlaPraise

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