Aegisub Aegisub is an advanced subtitle editor for Windows, and UNIX-like systems, such as Linux, Mac OS X and BSD. It is open source software and free for any use. Discontinued The project is no longer developed. Last version, 3.2.2, released in December 2014, can still be downloaded from the official site and GitHub. Free Open Source Mac Windows Linux Lua scripting Portable Spell checking Add a feature 104 Like