Collect is a free 360 video editing app for Android (iOS version TBA) and they have improved their app significantly since it first launched adding several new features:
– 💾 Save Projects into Collections!!
– 📏 Horizon line
– 🎯 Recentering & better way to interact with the camera
– 🔔 Export progress and notifications
– 🎙 Spatial/4D audio
– 🖐 Scrubbing at export preview
Here is a video by one of the lead developers, Oliver Pecha: