We would like to create a website that is essentially a classified ads aggregator. It would scrape and aggregate the ads from local websites posting classified ads in several categories such as buy/sell, Jobs, Real estate, etc.
The user would be able to sort them by price, location, etc (as per the categories).
The site would also accept the ads from users.
Using any open source classified website solution like osclass etc and adding the crawling functionality to it is also fine with us.
Sites that you can refer
1. [url removed, login to view]
We will not get any xml or rss feeds from the websites, so building a custom crawler is an ideal solution.