| Name | Description | Type | Package | Framework |
| BM25SimilarityFactory | Factory for BM25Similarity k1 (float): Controls non-linear term frequency normalization (saturation). | Class | org.apache.solr.search.similarities | Apache Solr Lucene |
| DefaultSimilarityFactory | Factory for DefaultSimilarity DefaultSimilarity is Lucene's default scoring implementation, based | Class | org.apache.solr.search.similarities | Apache Solr Lucene |
| DFRSimilarityFactory | Factory for DFRSimilarity You must specify the implementations for all three components of | Class | org.apache.solr.search.similarities | Apache Solr Lucene |
| IBSimilarityFactory | Factory for IBSimilarity You must specify the implementations for all three components of the | Class | org.apache.solr.search.similarities | Apache Solr Lucene |
| LMDirichletSimilarityFactory | Class | org.apache.solr.search.similarities | Apache Solr Lucene | |
| LMJelinekMercerSimilarityFactory | Class | org.apache.solr.search.similarities | Apache Solr Lucene | |
| SchemaSimilarityFactory | SimilarityFactory that returns a PerFieldSimilarityWrapper that delegates to the field type, if it's configured, otherwise | Class | org.apache.solr.search.similarities | Apache Solr Lucene |
| SweetSpotSimilarityFactory | Factory for SweetSpotSimilarity. | Class | org.apache.solr.search.similarities | Apache Solr Lucene |