SOUND ANALYSIS FREEWARE

I don't own a cell phone, but you most likely do.  There must be lots of apps that do sound analysis.  I learned about a very impressive one just by accident.  (Someone with an acoustics question pulled it up to show me his problem in real time.) It is a real-time display of the frequency spectrum of the sound the phone hears, called Spectroid: https://play.google.com/store/apps/details?id=org.intoorbit.spectrum&hl=en

Note: I don't currently use a Windows machine.  So the Windows software listed below comes from other people's recommendations.  If the operating system is not mentioned, all suitable versions are available.)

Real-time display and spectrum analysis:
	AudioXplorer (Mac); Syrinx (songbirdscience.com), Visual Analyzer (http://www.sillanumsoft.org/) (Windows) -- I use AudioXplorer.  It is still available for download but no longer "supported." That means someday it may no longer run on the newest Mac OS.

Analysis software, e.g., records, plays back, edits, analyzes segments, etc.:
	Audacity (many people's favorite)
	Praat (songbirdscience.com)
	Baudline
	Wave Surfer (recommended to me by an ex-chemist-turned-luthier; site claims that Mac bugs have been fixed; I have not yet re-tried it after initial disappointment)

Using analysis software:
	Some of the software actions are obvious.  Most come with Help and on-line Help.  Of course, you can ask Google, e.g., search audacity and question key words.  I recently stumbled on what looks like a good source for Audacity users: notes for a course by a composer and professor of music (at Simon Fraser U.)  So far, I'm impressed with his items #4 and 5 for Audacity:
	http://www.sfu.ca/~eigenfel/pdf-labs/

Tuners and tone generators (note: Audacity will generate multiple tones for you, too):
	ToneGen (initial version was free; now it comes as a 14-day trial)
	AudioTuner
	PerfectPitch
	(These are ones I got for myself years ago.  There must be zillions these days, e.g., to help people tune their instruments.)