While it hasn't been updated in a while (get ready for OSS and JACK support only (use jack)) and the website has a few missing images, it's hard to beat baudline for frequency analysis.
I only took a quick look for now, but this doesn't seem to give you musical note names? MeloCraft is mainly aimed at musicians, not really for general-purpose spectrogram analysis.
Also, no Windows binaries available? I understand it's open-source, but that's not very user-friendly imo.
http://www.baudline.com/what_is_baudline.html