Hi, Do you know any actually developed tool for analyzing audio files, since EncSpot (according to my knowledge) is developed no more ?

No, but:
MP3 Encoder Identification

try this link
http://www.hydrogenaudio.org/forums/index....showtopic=11946

Baudline (Unix app)
http://www.baudline.com/index.html

Extace (Unix App)
http://extace.sourceforge.net/
http://extace.sourceforge.net/images/full-screen.jpg #screenshot

Maate (Unix App)
http://www.cmis.csiro.au/maaate/

windows apps from here down,
RAE
http://www.ymec.com/products/app/eg.htm
http://www.ymec.com/

Frequency Analyzer 1.0
http://www.fileheaven.com/Frequency-Analyz...wnload/4931.htm

sat32_22
http://www.simtel.net/product.php?url_fb_p...duct_page=12760

Spectrum Analyzer pro Live 3.9
http://www.audio-software.com/analive.html

SpectraScope
http://www.freewareseek.com/audio/1145/