The best replacement for lightdm is gdm.

The best alternatives to lightdm are rated as following:

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Speaking about lightdm, one probably shouldn't forget about kde.

Other search terms related to lightdm and their ratings are:

★★★★★	kde
★★★	gdm

You have in mind a companion for lightdm and it is not yet here? Propose!

Scale is based on the average worldwide traffic of lightdm in all years. Click on graph for more.

lightdm

gdm

kdm