setting that aside, though, the best way to make software (open- or closed-source) extensible is via a plugin API. without it, the only way for end users to extend open-source software is to fork and maintain the fork forever, or attempt to merge upstream. so one might argue that the quality of the plugin API (and its documentation) is the primary measure of a software's "extensibility".
setting that aside, though, the best way to make software (open- or closed-source) extensible is via a plugin API. without it, the only way for end users to extend open-source software is to fork and maintain the fork forever, or attempt to merge upstream. so one might argue that the quality of the plugin API (and its documentation) is the primary measure of a software's "extensibility".