The best alternatives to Listenbox are Upload.fm, Listen Later, and Syncr. If these 3 options don't work for you, we've listed a few more alternatives below.
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Upload.fm watches your podcast feed for new episodes, combines the cover art and the audio into a video, and uploads it to YouTube automatically! Reach new audiences and get more listeners by publishing to YouTube.
Listen Later is a free service for converting videos into an audio podcast, which makes it easier to catch up on your video backlog during chores, errands and commutes. Listen Later works with services supported by youtube-dl.
Syncr is a multi-platform tool that stitches together a podcast from a bundle of your favorite YouTube videos that you can listen to anywhere at anytime.