Kuso IDE

Pida   (Compare Project)

License: gpl

Jupp’s Own Editor   (Compare Project)

License: GNU_General_Public_License_1_0

SXEmacs   (Compare Project)

Mostly written in C

License: BSD-3-Clause, gpl3_or_later

SynEdit   (Compare Project)

Mostly written in Pascal

License: gpl, mozilla_public_1

Vim   (Compare Project)

Mostly written in Vim Script

License: Vim_License

Padre   (Compare Project)

Mostly written in Perl

License: artistic_gpl

leksah   (Compare Project)

Mostly written in JavaScript

License: gpl

MVC Editor   (Compare Project)

Mostly written in C++

License: mit

JOE - Joe's own editor   (Compare Project)

Mostly written in C

License: gpl

DevParrot   (Compare Project)

Mostly written in Python

License: gpl3_or_later