I've been engaged in subtitling by translating Asian cinema in an amateur level
(the so-called second-generation translation or pivot translation) by using Subtitle Edit.
Subtitle Edit is the best freeware desktop-based subtitling software that I've been used so far.
I have already acquired a certificate from a subtitling training webinar.
Currently, I work voluntarily at TED.
You can see proof of my work here: https://tinyurl.com/y5fr9mqw