The password safe format is quite close, it is open source, free, and works most everywhere. PasswordGorilla (https://github.com/zdia/gorilla/wiki) provides support for the format on the three major OS'es (Linux, MacOS, Windows) with the same tool, and there are several Android phone apps. that inter-operate with the format, so you could also have your passwords available on your phone as well.

Lastly, the file storage format was designed by Bruce Shiner, so there is some reasonable assurance that the design was done right due to that heritage.