ACHE Crawler is described as 'ACHE is a web crawler for domain-specific search'. There are six alternatives to ACHE Crawler for Mac, Windows, Linux, Online / Web-based and BSD. The best alternative is Scrapy, which is both free and Open Source. Other great apps like ACHE Crawler are Mixnode (Paid), Heritrix (Free, Open Source), StormCrawler (Free, Open Source) and Apache Nutch (Free, Open Source).
StormCrawler is an open source SDK for building distributed web crawlers with Apache Storm. The project is under Apache license v2 and consists of a collection of reusable resources and components, written mostly in Java.