Zigzag is a multi-dimensional data organizing system by Ted Nelson, the creator of the "hypertext" concept and the Xanadu project. Things are organized into cells like a spreadsheet, but without the rigid two-dimensional structure. Zigzag is currently implemented in Perl and distributed as shareware for $25.00 U.S.
After using gpasman extensively for a long time, I recently upgraded
to 1.3.0 and within a few days for reasons unknown all versions of gpasman now segfault on different machines (with different libraries) when reading the, apparently now corrupted, password file right after the master password is entered. No response from the author so far after 36 hours.