2. Open Subtitle Editor. Packed With Features, Free, And Easy To Use. Among apps to edit subtitles, Open Subtitle Editor is a best pick. As the name implies, Open Subtitle Editor is open-source and free. As a subtitle editor, it's capable of resynching, removing and adding subtitles, plus creating subtitles from scratch. 2. Luke's English Podcast. Listening to podcasts is a great way to learn English. Luke's English Podcast is especially helpful because it has a feature that lets users speed up or slow down the playback. The podcasts also have transcripts available. In addition to slowing down the playback, users can stop, pause, and repeat the podcasts.