I still get visitors coming to this site looking for the outliner Natara Bonsai almost daily, as I mentioned it occasionally that it was one of my alltime favourite pieces of software. Unfortunately the Natara Bonsai download page went down sometime in 2014, never to come back again. There is now only a placeholder page for the main Natara site that points to the Natara blog (the last post on which dates 6 June 2013).
A few months after the Bonsai site has disappeared, I stumbled upon some kind of a mirror site at http://188.8.131.52/Bonsai/Download.cfm where it was still possible to download the software from. I was very happy to share that link, and I got a few emails from Bonsai fans thanking me for it. Apparently Bryan Nystrom, the owner of Natara Software, Inc., was kind enough to sell them a licence.
Alas, a few months ago this mirror site has also gone down. It seemed that Natara Bonsai was well and truly gone. I was kicking myself for not having taken some screenshots of that site at least, just as a keepsake (yes, that is how much I love this software). Then one day it occurred to me: what if there are some archival pages of the Natara site on the Internet Archive? And lo and behold, there indeed are a number of such pages. And not only that: the Bonsai files can still be downloaded from there! Here is one such link for instance: http://web.archive.org/web/20110519183308/http://www.natara.com/bonsai/Download.cfm
I cannot vouch for the safety of these files, so download and run them at your own risk. But chances are they might just be the original Natara Bonsai files. So fellow Bonsai fans, rejoice!