This page is very incomplete now, but I will add things as I have time.
I have written a little about creating packages for Solaris systems, so if you want to create .pkg format files to be installed on Solaris, you might want to check it out.
I wrote the above packaging on Solaris page while bootstraping RPM onto the Solaris platform. RPM, written by RedHat and used at the package manager for their popular linux distribution, has been ported to a number of platforms, now. It is a very good tool for building reproducible packages, and on a variety of platforms. In my job duties, it is often beneficial to have the same set of tools on a wide variety of machines. In order to accomplish this without RPM, it was often necessary to do scripting to build the tools on a variety of platforms and then use things like 'rdist' and/or 'rcp', and network filesystems like 'NFS'. Keeping multiple systems up to date with a wide range of tools was often a very time-intensive process.
Now, with RPM, it is possible to work through all of the necessary steps to build a package once, and build the .SPEC file that is used by RPM to build a package. Once that file is written, it is often very straightforward to build the same package on a different platform or to re-build a new version of tool when it is released. Most of this can be highly automated and done with little or no administrative intervention. This entire process needs more openly available tools, and needs better documentation, but it is a big time-savings.
For purely Solaris administration, you can find many of the most popular software packages available, already compiled and ready to install on SunFreeWare.com.
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If you need to reset an NT administrator password, you might want to check out this boot disk.