One Thing Well

Background Music is an audio utility for OS X ‘that automatically pauses your music player when other audio starts playing and unpauses it afterwards’. It also lets you set volume levels on a per-application basis.

Listen to your favorite audiobooks.

Bound is a simple, Dropbox-backed audiobook player for iOS.

App Store

Command line visualizer. Supports mpd, with experimental support for alsa and pulseaudio.

 See also

• spectrum

Stamp moves tracks and playlists across various services.

Move from Spotify, Rdio, Google Music, Deezer and YouTube to Apple Music, Spotify or Google Music.

Jukebox is an offline music player for audio files in your Dropbox.

Browse your music by song, artist, album, etc. and listen to music in a beautiful, fully-featured player.

App Store

Cable-free audio routing for Mac.

Create virtual audio devices to take the sound from applications and audio input devices, then send it to audio processing applications. Loopback gives you the power of a high-end studio mixing board, right inside your Mac.

Control pulseaudio volume from the shell or mapped to keyboard shortcuts.

Via Urukrama.

Just Press Record is a simple, professional audio recorder that instantly syncs your recordings across all your [Apple] devices. Available for iOS 9, watchOS 2 and Mac OS X.

App Store | Mac App Store

Peerflix is a command line streaming bittorrent client–given a torrent file or magnet link it will start downloading and pass the relevant audio or video on to your preferred media player.

Replacement for OS X’s built-in Speech services.

Features:

• Pause the audio
• Skip forward by sentences or paragraphs
• Replay sentences
• Progress Indicator
• Teleprompter Mode - Read along with audio

Via Brett Terpstra.

Per application volume control for your Mac.

By default, the app can control your Mac’s master volume and iTunes. However, with a free optional addon, the app will let you control volumes of all running apps individually (including any games, browsers, VOIP clients and music players you have on your computer).

Supports output devices other than built-in speakers, so you can route audio to your Bluetooth speakers, USB headsets or even HDMI televisions while still using Volume Mixer.

App Store

Latr.fm let’s you save episodes of podcasts to a single feed.

Think Instapaper or Pocket except for podcasts.

 See also

• Huffduffer

Extracts the audio from videos on YouTube, Vimeo, and many more sites and sends it to Huffduffer.

Via kung fu grippe.

When a loved-one passes away, sometimes the only recording you have of them is locked away on an answering machine or a voicemail box. Eventually the recording will disappear, either due to someone recording over it or service getting canceled. Before it disappears, use VMSave to save it, completely free.

Via MetaFilter Projects.