You need to add the IzzyOnDroid repo to see these

There is also M3U, which is the best one I could find when I tried some out earlier in the year.

I haven't used it myself, but LMMS is a free and open source alternative to FL Studio. Might be worth a try if you have trouble finding a copy of FL.

Yes, it can do normal video, time lapsed video and time lapsed images.

TimeLapseCam https://f-droid.org/packages/org.woheller69.TimeLapseCam/