I recently had an interesting experience with editing an htm file. I used Amaya 11.4.7 (the latest release) to open the gauges-ss-basic.htm file to edit one line I have at the bottom to copyright the weather data for my Steel Gauges display. All I did was change 2013 to read 2014. The next day I noticed that none of my Steel Gauges temperature displays were correct (external, internal, apparent, wind chill, heat index, etc.). And there was an errant ? character on my gauge displays. I restored the backup copy of the old gauges-ss-basic.htm file and everything was back to normal. I have used Amaya before without any problems but this was too buggy for my taste. I downloaded a copy of Brackets, edited the file with it, FTP'd the file up to the website and it works. I know you get what you pay for, but I am still too cheap to pay for an html editor.
What is your favourite free HTML editor?