The Stanford NLP tools are very good, and also GPLed, which works for a lot of projects. If the GPL doesn't work for you, the Apache OpenNLP project is also good.
BTW, it is not just having software packages to use: it is a ton of work obtaining and preparing training data. That said, Stanford NLP and OpenNLP tools come out of the box with trained models for tagging, entity name recognition, etc. For lots of uses, these pre-trained models will work well for you.