BlueFish is a free and open source text editor supporting a wide range of languages, multiple document interface, powerful search tools, in-line checking and auto-recovery, and other features.
It is perfectly suited for most markup and programming languages, much better than Text docs, but it is not ideal for anyone who'd like a visual editor.
If you're doing any sort of text editing, you should consider Vim--once you climb the learning curve, you'll be faster and more efficient at everything you do. Also, Vim is my default search/replace tool--whenever I need to make changes throughout a document, most often, I'll copy and paste into a Vim window so that I can take advantage of regexp-based replacements. Vim isn't for the faint of heart, though--it's hard to learn and super complex. If you use a text editor once or twice a month, or just need a simple way to strip out formatting, Notepad will get you where you want to go without all the confusion.
Easily found and downloaded. If I need someone to go to the web and grab it I can tell them the URL. It is easily installed and one can be edited in minutes.
BlueFish is easy to use. It can have a non-technical user use it to edit config files or text documents and not have them frustrated. It has a friendly straight forward user interface.
BlueFish does a really good job editing HTML documents specifically. Probably one of the best HTML editors left out there.
There are WYSIWYG Open alternatives, some of which work perfectly as an Open version of Dreamweaver, but the only suggestion I would have is that Bluefish add a WYSIWYG tab, e.g. code/visual.
I don't consider the steep learning curve to be a hinderance on the overall usability. I would rate this a ten, but to be honest a lot of people do get hung up at the beginning and just abandon it. However, for people who have made the moderate effort to get over the hump, nothing can be more usable.
As with most GNU GPL products support is top-notch. Documentation is fantastic, all functions are documented. Also, this product has been around for more than a decade so there is lots of stuff on how to do this or that with this tool. The only thing holding you back from support is your own drive to find a solution. RTFM, my friend.
The support is somewhat lacking; Vim doesn't really have support outside of its forums. The forums, while notably good, aren't equal to real support though, and the steep learning curve makes you wish there was a help desk that would assist with all of the basic questions. There are several handy books and guides that can be found, and most implementations of the product come with "vitutor" which walks you through its usage.
BBEdit is fantastic but it costs money. Frankly, BBEdit is not worth paying for. All you are doing is paying old software and I have a problem asking people to do that. Also, BBEdit is limited to the small Mac Universe. Likewise, Notepadd++ is only found on Windows but I much better than BBEdit. Finally, there is Atom. I like Atom a bunch because it has a lot more functionality than BlueFish. Atom is a better code editor than BlueFish. Also, the Atom interface is a bit confusing to the new user.
I think it comes down to usability (and frankly, just preference). There's an old adage that Emacs is a good Operating System with a poor Text Editor! Jokes aside, when looking at different text editors, such as Emacs or Nano, Vim is the one that is usually always preferred because of how simple it is to learn. The learning curve of Vim compared to other text editors just makes it such a natural choice.
