From evoldir:

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Dear evol community,

Please note my new free software, Lep-MAP2, for linkage map construction
for single and multiple full-sib (and similar) crosses. I can be used for
very large numbers of offspring and markers and can be run parallel on
typical computer clusters.

For more info, there is an article out on Lep-MAP2:
http://gbe.oxfordjournals.org/content/8/1/78.full

The software can be obtained from sourceforge,
https://sourceforge.net/projects/lepmap2/

Cheers,
Pasi Rastas
Research Associate
Butterfly Genetics Group
Department of Zoology
University of Cambridge
United Kingdom

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