At this time, only OS X and Windows versions are available. Source code will not be made available.
For more information on the dnskl and edexter features consult the supplied documents in the distribution.
Alternatives to dnskl:
Those who require filtering for more than one computer, such as government or commercial entities, should consider other options. Fortunately, there are several low-cost (even free) alternatives for large-scale filtering needs. For example, David Glosser's BlackHole DNS for Spyware white-paper, which is available on www.malwaredomains.com, describes how to use DNS redirection with BIND - an open source (free) DNS server. MalwareDomains.com also provides BlackHole DNS block lists for both the Microsoft and BIND name server programs.
Another excellent name server, Treewalk, can use the Confetch plugin for DNS redirection filtering. TreeWalk DNS is also compatible with the BIND filtering instructions on Glosser's paper and includes a graphical interface for those using the Window's environment.
For more information on the dnskl and edexter features consult the supplied documents in the distribution or contact Pyrenean