Every now and then, I find something free ( or open source) that is absolutely valuable to my job. Occasionally, I'll announce them. here are some that I use
Notepad++
"a free source code editor (and Notepad replacement), which supports several programming languages, running under the MS Windows environment."
7-Zip
An open-source file archiver supporting numerous formats.
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Here are some others I've used over the years:
PDF 995
Pdf995 comes with a PDF printer driver and PDF creator so that you can create PDF files. It displays a popup add which can be removed when purchased. Otherwise, it's totally free.
Skype - Free telephony. This is essential for communication with people and you can buy an inexpensive account so that you can all regular phone numbers.
Color Detector - this tool has been helpful when I've needed to determine the color of something an artist has created when I work on user interfaces.
Not Free but extremely useful
Camtasia Studio - Screen recorder. I use this to create flash recordings for clients so that I can show them something I've done or something we need to look into.
GotoMeeting. Online meetings with conference calling, Fifty bucks a month - unlimited meetings. This tool is a must!
Beyond Compare - My favorite file comparison tool.
Have fun! Any others I should add?