WordPress 4

Flexible, multi-functional software with lots of plug-ins available. But, it supports just one blogger platform - Wordpress. May be more, but it does not support Blogger, where my main sites are. There are multiple advantages and luxuries of being Wordpress blogger: categories support, ability to upload files, password protection option, and some others, as well as some disadvantages. Anyway, limiting the software by a single platform application - a big software limitation.