What are these plants
The first photo is ajuga. This is a groundcover that becomes a terrible nuisance in most instances. It is also a foreign invasive plant. We recommend that you pull it up and replace it with something, native if possible. (Avoid English ivy!)
The other photos look very similar to several plants. Send us photos when they flower and we'll let you know . If it is a weed, then you can pull it before it produces seeds for next year.