You can also use the Emacs mode (disclaimer: I'm the autor), which not only gives you reasonable input methods for APL characters, but also a lot of other featu

You can also use the Emacs mode (disclaimer: I'm the autor), which not only gives you reasonable input methods for APL characters, but also a lot of other features such a source code navigation and the ability to edit matrices in SES (the Emacs spreadsheet). https://github.com/lokedhs/gnu-apl-mode https://github.com/lokedhs/gnu-apl-mode And a video I made to demonstrate some of its features: https://www.youtube.com/watch?v=yP4A5CKITnM https://www.youtube.com/watch?v=yP4A5CKITnM