I don't know about Linux, but I've been using KeePassX for Mac for about a year now. It only supports the older KeePass file format, and it's ugly, but it work

I don't know about Linux, but I've been using KeePassX for Mac for about a year now. It only supports the older KeePass file format, and it's ugly, but it works great. There are also a few iOS apps you can use, my favorite of which is KyPass.