DokuWiki. If it's just about quickly sharing one page with some pictures, videos, structured text and a descriptive URL, which I also can easily set permissions for outside people, logged-in users, specific groups,... a wiki for me does the job preeeeeeetty well so far. Plus, all my info is already there. Not comparable to all the other solutions mentioned here though, neither feature-wise nor philosophically.
Oh, and DokuWiki uses .txt files for its pages, which can directly be edited from the file system.
Oh, and DokuWiki uses .txt files for its pages, which can directly be edited from the file system.