Preface: My apologies for reordering your list; however, it will prevent repetition.
Statement: Unless I am incorrect, the supplemental content for these games is optional (as opposed to Trials, whose installation is required to upgrade Icewind Dale to v1.42). However, these are valid examples of post-release content, if not exactly in the vein I had specified. Raven Software's maps for Elite Force and Jedi Outcast/Academy would also fall in this category. Statement: Alas, I have not had the opportunity to play either of these. Observation: It is dubious as to whether subtitles constitute "additional content", especially when many would have considered their inclusion in the original release mandatory.