• How NLTK Discovers Third Party Software
• Java
• Windows
• Linux
• Stanford Tagger, NER, Tokenizer and Parser.
• Tadm (Toolkit for Advanced Discriminative Modeling)
• Megam (MEGA Model Optimization Package)
• C&C Tools/Boxer
• Prover9 & Mace4
• Malt Parser
• Hunpos Tagger
• Senna for Various NLP Tasks
• CRFSuite for CRF Tagger
• REPP Tokenizer