It is still alive: http://harbour.github.io/
I loved Clipper, Summer 87 … wow, I wrote Seminar management software with it and made my first real good money. Nearly 30 years went by - it can’t be true … so quickly, amazing.
Axialis IconWorkShop / icoFX for icon creation
Serif DrawPlus for drawing graphical interface objects
Agama Web-buttons for creating custom made buttons
EdrawMaxPro for structuring ideas and planning
BBflashback for videotutorials
Faststone Screencapture for screencapture
BoxShot and TrueBoxShot cover editor for cover design
Atlantis Wordprocessor for creating text documents
TopStyle 5 for creating xhtml/CSS/xml documents
Inkscape for vector graphics - inkscape.org
GIMP for bitmap graphics - gimp.org
Audacity for editing audio files - audacity.sourceforge.net
JSONLint to validate JSON strings with - jsonlint.com
7-Zip for archiving - 7-zip.org
Notepad++ - notepad-plus-plus.org
TextWrangler (editing HTML, XML, text data) - http://www.barebones.com/products/textwrangler/
Pixelmator (preparing icons and graphics) - http://www.pixelmator.com
Manga Studio 5 (preparing graphics) - http://manga.smithmicro.com/mangastudio5/
Bfxr (preparing sound effects) - http://www.bfxr.net
Sound Studio 3 (editing sounds) - http://felttip.com/ss/
Dash (storing code snippets) - http://kapeli.com/dash
Synergy (using one mouse/keyboard to control a second test computer) - http://synergy-foss.org
RB Package Maker Studio (packaging for MAS) - unfortunately, the developer disappeared 
Blender
Saltshaker
Windows
Paint.Net
Word
Excel
Classic Shell
Minecraft Server (*of course for the kids) 
Komodo Edit (Create Help files)
TIght VNC (for linking to Mac)
Inno
Mac
Mac OS X -The missing manual