| Name | Description | Type | Package | Framework |
| PorterStemmer | Stemmer, implementing the Porter Stemming Algorithm The Stemmer class transforms a word into its root form. | Class | opennlp.tools.stemmer | Natural Language Processing (OpenNLP) |
| SnowballStemmer | Class | opennlp.tools.stemmer.snowball | Natural Language Processing (OpenNLP) | |
| SnowballStemmer .ALGORITHM | Class | opennlp.tools.stemmer.snowball.SnowballStemmer | Natural Language Processing (OpenNLP) | |