Just a few music/audio programs that I found useful.
Audacity - Free, open source, cross-platform audio software
Audacity is an easy-to-use, multi-track audio editor and recorder. Can be used to convert FLAC to Mp3 (not in batch). Useful to trim songs down that have parts you don't care for (example: an extended intro that is not needed)
This program also has a nice sound recorder for anything that plays across your speakers. If you can't get a song any other way, record it via Audacity and save it.
https://www.audacityteam.org/Fre:ac - A free audio converter and CD ripper for various formats and encoders. It features MP3, MP4/M4A, WMA, Ogg Vorbis, FLAC, AAC, and Bonk format support, integrates freedb/CDDB, CDText and ID3v2 tagging. I find this useful for converting batch (lots) FLAC format albums I download to Mp3 formats. Something that Audacity can only do one song at a time.
https://sourceforge.net/projects/bonkenc/Mp3Gain - Tired of reaching for your volume knob every time your mp3 player changes to a new song? MP3Gain analyzes and adjusts mp3 files so that they have the same volume.
MP3Gain does not just do peak normalization, as many normalizers do. Instead, it does some statistical analysis to determine how loud the file actually sounds to the human ear.
Also, the changes MP3Gain makes are completely lossless. There is no quality lost.
I use this quite a lot and usually keep the setting at 90db. If you don't like how loud or quiet a song sounds compared to others in your collection, change it so it fits in your mix better.
http://mp3gain.sourceforge.net/Ocenaudio - is a cross-platform, easy to use, fast and functional audio editor. It is the ideal software for people who need to edit and analyze audio files without complications.
https://www.ocenaudio.com/downloadShuangs Audio Joiner 2.5 - Shuangs Audio Joiner is a free audio file join tool. It can combine WAV, MP3 and WMA which are in various formats, frequencies and tracks into one file.
I occasionally use this to combine the best of two mixes of songs I like. Perhaps I like the beginning of one mix and the end of another mix, I can use this to make one file. Also note I use version 2.5, not sure, but the newer versions may display ads, so I just keep with the older version that I will link below.
https://www.freewarefiles.com/Shuangs-Audio-Joiner_program_50112.html________________________________
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Have a program you like, please comment and share. I am always looking for new free programs to try.