Twine
Twine describes itself as an “open-source tool for telling interactive, non-linear stories.”
Audacity
Audacity is a free, open-source digital audio recording and editing software. Audacity is easily accessible across various platforms, relatively easy to learn for beginners, and has a robust offering of features making it an excellent choice for your audio needs.
Camtasia
Camtasia is a video capture and editing software used to create audio and visual multimedia including recorded screencasts, webcam recordings, voice-over and audio recordings. Camtasia offers more robust editing compared to Kaltura, but may require purchasing a license key and does not integrate directly into Moodle.