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Artifact search engine:

https://repository.jboss.org/nexus/index.html

Another artifact search engine:

http://mvnrepository.com/

Maven Central Repository Browser

http://search.maven.org/#browse

Repository that contains prehistoric dependencies such as apache-httpclient:commons-httpclient. Despite being deprecated, project such as Arquillian depend on jars contained in that repository! Go figure…

<repository>
	<id>JBoss deprecated</id>
	<name>JBoss deprecated repository</name>
	<url>https://repository.jboss.org/nexus/content/repositories/deprecated/</url>
</repository>

When importing existing Maven projects into eclipse, be sure the following snippet is present in the pom.xml. Specially if you import projects that use Servlet 3.0!

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <source>1.6</source>
                <target>1.6</target>
                <showWarnings>true</showWarnings>
            </configuration>
        </plugin>
    </plugins>
</build>