The best alternatives to Verdaccio are Code Climate, bricks, and JavaScripting. If these 3 options don't work for you, we've listed a few more alternatives below.
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Hurree— The smarter, simpler way to analyze your data
Bricks is an open-source collection of modular natural language processing modules. Find elements such as language detection, sentiment analysis, emotion detection and 50 more - all open-source, for free, and ready to be integrated in whatever use case you are implementing!