We are currently working on an online subtitling software which will be freely available to linguists to work on projects for Pixelogic Media.
If you have your own subtitling software, you may use that provided it can export a Netflix DFXP file.
If you do not already have your own software, we recommend using EZTitles (www.eztitles.com) for creating subtitles.
Depending on the volume of work, Pixelogic Media can provide a temporary license. If you wish to get your own, we recommend the monthly rental license as it is relatively cheap, gives you the latest updates/improvements and comes with support.