PivotX is an open source blog-building tool distributed under the GPL license. It is written in PHP using flat files to store content. Although it is a blog software, it also can be used to maintain more complex websites.
This platform lets you maintain multiple weblogs as well as separate web pages. Using the themes is very easy as you can download or create them yourself. Moreover, it is possible to apply a different theme to each page. It is very easy for developers to adjust and extend this platform due to its flexible templating system. While speaking about multiple weblogs, you can maintain them within one installation. PivotX has built-in anti-spamming measurements which make it harder to leave comment spam.
In case this platform sounds like a good alternative to you, it is time you migrated your current website to PivotX. CMS2CMS migration service will help you make this process easy and fast, converting the data in a blink of an eye.