Natural language processing resources - Tools

IR

• Indri
• Lucene

General text analysis

• TMG
  
• GATE
• Lingpipe
• UIMA
• GIZA++
• OpenNLP
• Gensim 
• Sketch Engine
• BootCaT

More pointers

• http://www.searchtools.com/tools/tools-opensource.html

P.S.-- I will keep adding links as and when I find them.