Source Monitor provides basic metrics such as software tools.

Lots of alternatives exists depending on the programming language.

If you want as an open source option,

you can take a look at SonarQube

https://sourceforge.net/projects/simpleapimetric/ , http://www.analizo.org/ , https://gitorious.org/analizo , http://www.sonarqube.org/ , http://metrics.sourceforge.net/

And there are some other commercial tools:

http://www.ndepend.com/ , http://clarkware.com/software/JDepend.html , http://www.virtualmachinery.com/jhawkprod.htm , http://www.semdesigns.com/Products/Metrics/

http://www.borland.com/Products/Requirements-Management/Together

You can find how the object-oriented metrics determine from a software?

http://www.cc.uah.es/drg/b/RodHarRama00.English.pdf

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.159.8788&rep=rep1&type=pdf

Metric tool would get base values ( e.g.  effort, defect. cost ) either manually or through some automation script.  The tool is normally programmed to calculate, compare , analyze and report dashboards. Depending upon which domain you need metrics parameters measured , there are lots of software tools available in market.

There are number of metrics tools available for computing metrics of software system such as CKJM, SCI tool, Harry Sneed etc.