Aegisub – Extensively-used advanced subtitles editor

Aegisub (successor of the original SubStation Alpha and Sabbu) is a free, open-source and cross-platform advanced subtitles creating & modifying tool. Recognized as an industry standard of all subtitle editors, it is widely used by numerous subtitle groups and subtitling fans for the subtitling and translation of concert, OP, PV, TV, animation and some other aspects like video post-production.