Tag Manager (http://tagmanager.medieval.it (http://tagmanager.medieval.it)) is a tag editor web application running on all modern webassembly-capable browsers. Currently in BETA version it can manage ID3v2, ID3v1, Lyrics3 and APE tags only for MP3 and APE audio files.
It completely runs on CLIENT-SIDE browser, so no data will be sent over the network. Initially started as an internal project now it might be useful to end users too. More ID3v2 tags will be supported in the future, any suggestion is welcome.