It's far from perfect, for instance how do I access my bookmarks while offline ?

from the original shaarli FAQ:

What use Shaarli and not Delicious/Diigo ?

With Shaarli:

    The data is yours: It's hosted on your server.
    Never fear of having your data locked-in.
    Never fear to have your data sold to third party.
    Your private links are not hosted on a third party server.
    You are not tracked by browser addons (like Diigo does)
    You can change the look and feel of the pages if you want.
    You can change the behaviour of the program.
    It's magnitude faster than most bookmarking services.