- https://github.com/thavelick/summarize/ - Python, TF (very simple)
- Reduction - Python, TextRank (simple)
- Open Text Summarizer - C, TF without normalization
- Simple program that summarize text - Python, TF without normalization
- Intro to Computational Linguistics - Java, LexRank
- Sumtract: Second project for UW LING 572 - Python
- TextTeaser - Scala
- PyTeaser - TextTeaser port in Python
- Automatic Document Summarizer - Java, Bipartite HITS (no sources)
- Pythia - Python, LexRank & Centroid
- SWING - Ruby
- Topic Networks - R, topic models & bipartite graphs
- Almus: Automatic Text Summarizer - Java, LSA (without source code)
- Musutelsa - Java, LSA (always freezes)
- http://mff.bajecni.cz/index.php - C++
- MEAD - Perl, various methods + evaluation framework
- Library with learning capability - Python, I got the info from Alex #62