I'd agree that the second looks like ludwigia of some kind though I couldn't tell you which specifically. The third plant looks to me like Bacopa Caroliniana, similar to moneywort.
All three of them are stem plants with the first two being cuttings - meaning the roots didn't rot off in transit, they haven't formed yet. Plant them and in time they'll develop roots. When they get too tall you can just cut them down and plant the tops and again, in time they'll develop roots. Also, if you want shorter, bushier growth, trim them back more often and where you've cut them they'll often tend to branch out. Great extras, good luck with them!!
All three of them are stem plants with the first two being cuttings - meaning the roots didn't rot off in transit, they haven't formed yet. Plant them and in time they'll develop roots. When they get too tall you can just cut them down and plant the tops and again, in time they'll develop roots. Also, if you want shorter, bushier growth, trim them back more often and where you've cut them they'll often tend to branch out. Great extras, good luck with them!!