MR. LINCOLN (c.1952, Television Program, USA): Honorable mention as Kubrick is listed as a 2nd Unit/Assistant Director. Unlike almost all the other works referenced, this piece probably does not reflect Kubrick's creative/artistic process, however he did contribute to the production.
ONE EYES JACKS (r. 1961, Color Feature Film, USA, 141min): I mention this historical Marlon Brando film because Marlon Brando reportedly replaced Kubrick as the publicized director after creative differences arose. Per Wikipedia: Kubrick worked for six months on the Marlon Brando vehicle One-Eyed Jacks (1961). The script was written by then unknown Sam Peckinpah, and Kubrick insisted on rewriting it. Kubrick quit as director, explaining that "Brando wanted to direct the movie." Kubrick much impressed Brando who spoke fondly of him. For more info, check outWikipedia's entries on Stanley Kubrick and One Eyed Jacks.​
DR. STRANGELOVE PROMO REELS (Circa 1964): Very interesting footage of what appears to be promo reels produced and narrated by Kubrick himself for studio/distributor consideration containing extended and alternative takes. Click here for a full example on YouTube!
DGA AWARD ACCEPTANCE SPEECH (c. 1998, color video, UK/USA, ~4mins): Short and sweet self-produced video thanking the Director's Guild of American for the unique D.W. Griffith Lifetime Achievement Award. Probably the last time the public can see/hear Kubrick alive on recorded media. I believe this is only time Kubrick filmed himself speaking into the camera for a large audience. Can be found on the EWS Special Edition DVD's Click Here for a low-quality but watchable version on YouTube