Several companies have supported the development of this document
by paying authors to work on it full-time, paying for publication, etc. In particular, BSDi (subsequently acquired by <link
xlink:href="http://www.windriver.com">Wind River Systems</link
>) paid members of the FreeBSD Documentation Project to work on improving this book full time leading up to the publication of the first printed edition in March 2000 (ISBN 1-57176-241-8). Wind River Systems then paid several additional authors to make a number of improvements to the print
infrastructure and to add additional chapters to the text. This work culminated in the publication of the second printed edition in November 2001 (ISBN 1-57176-303-1). In 2003-2004, <link
xlink:href="http://www.freebsdmall.com">FreeBSD Mall, Inc</link
>, paid several contributors to improve the Handbook in preparation for the third printed edition.