Simple library and command line utility for extracting summary from HTML pages or plain texts. The package also contains simple evaluation framework for text summaries. Implemented summarization methods:

• Luhn - heurestic method, reference
• Edmundson heurestic method with previous statistic research, reference
• Latent Semantic Analysis, LSA - one of the algorithm from http://scholar.google.com/citations?user=0fTuW_YAAAAJ&hl=en I think the author is using more advanced algorithms now. Steinberger, J. a Ježek, K. Using latent semantic an and summary evaluation. In In Proceedings ISIM '04. 2004. S. 93-100.
• LexRank - Unsupervised approach inspired by algorithms PageRank and HITS, reference
• TextRank - some sort of combination of a few resources that I found on the internet. I really don't remember the sources. Probably Wikipedia and some papers in 1st page of Google :)

Here are some other summarizers:

• 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

Make sure you have Python 2.6+/3.2+ and pip (Windows, Linux) installed. Run simply (preferred way):

$ [sudo] pip install sumy

Or for the fresh version:

$ [sudo] pip install git+git://github.com/miso-belica/sumy.git

Or if you have to:

$ wget https://github.com/miso-belica/sumy/archive/master.zip # download the sources
$ unzip master.zip # extract the downloaded file
$ cd sumy-master/
$ [sudo] python setup.py install # install the package

Sumy contains command line utility for quick summarization of documents.

$ sumy lex-rank --length=10 --url=http://en.wikipedia.org/wiki/Automatic_summarization # what's summarization?
$ sumy luhn --language=czech --url=http://www.zdrojak.cz/clanky/automaticke-zabezpeceni/
$ sumy edmundson --language=czech --length=3% --url=http://cs.wikipedia.org/wiki/Bitva_u_Lipan
$ sumy --help # for more info

Various evaluation methods for some summarization method can be executed by commands below:

$ sumy_eval lex-rank reference_summary.txt --url=http://en.wikipedia.org/wiki/Automatic_summarization
$ sumy_eval lsa reference_summary.txt --language=czech --url=http://www.zdrojak.cz/clanky/automaticke-zabezpeceni/
$ sumy_eval edmundson reference_summary.txt --language=czech --url=http://cs.wikipedia.org/wiki/Bitva_u_Lipan
$ sumy_eval --help # for more info

Or you can use sumy like a library in your project.

# -*- coding: utf8 -*-

from __future__ import absolute_import
from __future__ import division, print_function, unicode_literals

from sumy.parsers.html import HtmlParser
from sumy.parsers.plaintext import PlaintextParser
from sumy.nlp.tokenizers import Tokenizer
from sumy.summarizers.lsa import LsaSummarizer as Summarizer
from sumy.nlp.stemmers import Stemmer
from sumy.utils import get_stop_words


LANGUAGE = "czech"
SENTENCES_COUNT = 10


if __name__ == "__main__":
    url = "http://www.zsstritezuct.estranky.cz/clanky/predmety/cteni/jak-naucit-dite-spravne-cist.html"
    parser = HtmlParser.from_url(url, Tokenizer(LANGUAGE))
    # or for plain text files
    # parser = PlaintextParser.from_file("document.txt", Tokenizer(LANGUAGE))
    stemmer = Stemmer(LANGUAGE)

    summarizer = Summarizer(stemmer)
    summarizer.stop_words = get_stop_words(LANGUAGE)

    for sentence in summarizer(parser.document, SENTENCES_COUNT):
        print(sentence)

Run tests via

$ nosetests-2.6 && nosetests-3.2 && nosetests-2.7 && nosetests-3.3