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I'm looking for a good open source web crawler and i found these:

DataparkSearch, GNU Wget, GRUB, Heritrix, ht://Dig, HTTrack, ICDL, mnoGoSearch, Nutch, Open Search Server, PHP-Crawler, tkWWW Robot, Scrapy, Seeks, YaCy.

But I can not decide which is the best to search for products and prices.

Does anyone have experience with web crawler and could help me?

Only a tip for where i can read something helpful will help so much.

If this question was asked in wrong StackExchange site please please tell me which one is correct.

share|improve this question

closed as not constructive by paulmorriss Mar 15 '13 at 16:35

As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance.If this question can be reworded to fit the rules in the help center, please edit the question.

wget is not a crawler - it is a software that can fetch webpages - "GNU Wget is a free software package for retrieving files using HTTP, HTTPS and FTP, the most widely-used Internet protocols. It is a non-interactive commandline tool, so it may easily be called from scripts, cron jobs, terminals without X-Windows support, etc." – elssar Mar 14 '13 at 13:52
If the listed do not suite your needs why not learn how to build one in python? Also @elssar is right, wget is a software for retrieving pages. If you read the wget manual you can code WGET to act like a crawler. – Darth_Vader Mar 14 '13 at 14:58
What feature do you need that these don't have? For example do you need it to be directed to only the "product pages" of a website so that it doesn't crawl the entire site? Do you need a crawler that can extract the product and price data from the pages into a more machine readable format? – Stephen Ostermiller Mar 14 '13 at 15:03
it depends what you would like to do with it? scrape? in what language do you want to develop or are you looking for a search engine, complete with crawler, like Sphider? – uberconversion Mar 14 '13 at 15:04
elssar: wget has a recursive option that does turn it into a crawler. – Stephen Ostermiller Mar 15 '13 at 2:25

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