I started to rewrite Thot form PHP to Java. The reason is that it will not be no longer installed on the same server as website, but will work as a service. Only small plugin will be installed in CMS to communicate with the service. The need of install Thot for each website was one of the biggest problem of the first version.
The scope of functionality will also change. I plan to focus more on statistical NLP of a website content to help text editors in preparing better content for users and search engines. This can be e.g. suggesting tags, building summary, showing connection with other posts.
The new version is developed using Spring framework and Hibernate. As database engine I use MySQL InnoDB. Maybe there will be need to change this technologies if the performance will be not enough.