NLPCraft is described as 'open source library for adding natural language Interface to any application. It's simple to use: define a semantic model and intents to interpret user input'. There are three alternatives to NLPCraft for Self-Hosted solutions and Node.JS. The best alternative is NLP Compromise, which is both free and Open Source. Other great apps like NLPCraft are Talisman JS (Free, Open Source) and WinkJS (Free, Open Source).