Any free software available instead of musically and dubsmash android app ?
Is it really necessary? These apps are mostly fads (they appear to be trending but only for a short while), once the general public obsessed with these apps gets bored these apps would disappear.
Personally I am not in favour of creating alternative for every X proprietary bullshit out there.
However, if someone deems it worth their time to write free software replacements for these programs, that is perfectly fine.