I just spent a few days cleaning up a ruby interface to Open Text Summarizer that I had written a year or so back. https://github.com/deepfryed/ots

There is fair bit of overlap to https://github.com/ssoper/summarize which I came across later.

The main differences are: 1. ots avoids extending core classes. 2. parses text only once in case you need to summarize the text again, get keywords or topics. 3. fixes issues in libots that results in segmentation fault in multi-threaded environments while using other gems using libxml2.

Any feedback is much appreciated!