Lately I discovered that I depent on a password manager. But that's easier said than done.

On Windows I go for KeePass Classic. On Linux, I'm lost. I see theese three are currently developed. I see there are many others with no activity in the past few years. And that's bad for security.

Right now I went for simplicity's sake with KeePassX. Because it handles KeePass 1.x files. But there is no trace of documentation. I am using it only because I rely on the security of the container made by KeePass. But I read the new version 1.24 adds new security features:

Header data in KDB files is now authenticated (to prevent silent data removal attacks; thanks to P. Gasti and K. B. Rasmussen).
The content part of a KDB file now contains 32 random bytes (generated each time the file is saved, by a cryptographically secure pseudo-random number generator using system entropy) to prevent content guessing attacks using the content hash.

I have no idea when these will follow into KeePassX given the lack of information. Also, the old format means no Unicode support and less flexibility in the fields of a recording.

KeePass 2.x can run with the help of Mono. But I've seen far smaller projects than Mono excusing itself: we're not paid to do that, or the classical OS anwer: code it yourself. Given these are all my passwords, and it's only one basket I'm less willing to add another unreliable variable to this mix.

What do you know about the others? What would you advise?

I also use KeepassX from keepassx.org and am quite happy with it. In particular, I like the portability of the databases among different platforms. I learned about it from a company which uses a mix of Linux and Windows computers and recommends it to their staff for precisely that reason.

The help file in the application is quite well done and there's a FAQ at the website: http://www.keepassx.org/faq/

I have no experience with either of the others.

I use KeePassX cross-platform. Works quite well. I've used PasswordSafe on Windows for years and it also works well.

Not familiar with FPM2, though looking at teh web page I'd have to question their logic in moving from Blowfish to AES.

KeePass is best choice, it's support multiple platform: MacOS, Linux, Windows
Also KeePass can management entry very smart

I prefer KeePassX to KeePass as it doesn't require Mono(.NET) to function.