A recent blog post by Simon Willison:

Extremely promising new Python NLP tool: spaCy (commercial open-source software):
Unfortunately, it is only able to deal with English input at the moment and installation on Windows seems to be tricky. The project is currently under intense development and it will be interesting to check the following links on a regular basis:
License: AGPLv3 (free for open-source projects), changed to MIT License (27 Sep 2015)
Source: http://spacy.io/index.html#detailed-speed-comparison [accessed: 24/07/2015]
Link to community-edited list on Pansop
Source: http://www.datasciencecentral.com/profiles/blogs/python-nlp-tools [accessed: 24/07/2015]
Tested on: Xubuntu 12.04 LTS (64-bit), using default python interpreter (v2.7.3)
[Last update: 04/03/2014]
sudo apt-get install python-tk
mkdir TextSTAT
cd TextSTAT
wget http://neon.niederlandistik.fu-berlin.de/static/textstat/TextSTAT-2.9c-source.zip
unzip TextSTAT-2.9c-source.zip
chmod +x TextSTAT.pyw
./TextSTAT.pyw
TextSTAT.desktop on your Desktop, don’t forget to adapt the full path to TextSTAT.pyw and textstat_logo.gif):wget http://neon.niederlandistik.fu-berlin.de/static/textstat/textstat_logo.gif
[Desktop Entry] Version=1.0 Type=Application Name=TextSTAT 2.9c Comment=Concordancing Program written in Python Exec=/path/to/TextSTAT/TextSTAT.pyw Icon=/path/to/TextSTAT/textstat_logo.gif