Mostly my career has been in non-fiction because that's where the money is.
My professional non-fiction career began in 2003, when I started writing reviews of PC hardware for my own review site, thejemreport.com (I'm not going to link to it because I no longer own the site and I have no idea what's there anymore). Then I started writing reviews of software, and that got me an offer to freelance for the media company formerly known as the Open Source Developer Network (OSDN, later renamed Open Source Technology Group (OSTG), and I think it was known as either SourceForge or ThinkGeek at the end of its life (both of those sites were in the OSDN portfolio)). At the time, OSDN encompassed Slashdot, SourceForge.net, ThinkGeek, and some content sites: NewsForge.com (now redirects to sourceforge.net), which was an online newspaper covering Linux and open source software; Linux.com (now owned by the Linux Foundation; I know no one currently working there), which mostly published how-to guides and tutorials (aside from republishing Linux-related stories from NewsForge); and IT Manager's Journal (also gone; looks like someone bought the domain name and put one blog post on it a long time ago), which published mostly news stories and interviews about IT management.
After that, I continued to freelance for some Linux news sites, though the only one I can remember right now is Linux Today. I also wrote a few articles outside of that context.
reasonably complete list of articles I wrote.
Here are the non-fiction books that I officially have authorship of:
I'd originally intended to update those titles for each major software release, but that never worked out for various reasons: Sams Publishing didn't want to do any more in this series, ORM wanted a new edition of the BSD titles but I couldn't find the time to write and research them, and the last one was a one-off publication that ORM commissioned on behalf of a company that was eventually acquired by Google.
I also had "silent authorship" of the following titles; it was not a secret that I contributed to them, but my name did not appear on the cover (nor did I want it to; if I don't have control over the finished product, then I don't want my name on it):
Books that I have substantially worked on in a ghostwriting, project management, and/or technical editing capacity:
Finally, there were 12 book projects that were never completed for various reasons. Some were ghostwriting projects that the author lost interest in. Most recently the named author on a project I completed passed away from COVID-19 before his book was published, and to my knowledge it is still warehoused. A few other titles were projects that I started and planned on pitching to publishers, but eventually I decided they weren't worth the effort. Some titles I had contracts for, but they were cancelled because the editor wanted to do too much "editing" or wanted to alter the structure or topic of the book in a way that I felt wouldn't work for the target readership.