The particle eens (often combined with even) gives the imperative a friendlier, milder tone. The particle even has a function very similar to eens. It makes the imperative friendlier, more casual, and it makes it sound as though it should take the listener no time or effort to carry out the command. The particle maar also makes the imperative much friendlier, and at the same time it gives it a tone of encouragement or permissiveness. It is often combined with even. Some examples:
Kom eens (even) hier. Come here (for a minute), please. Geef me even je pen. Give me your pen for a minute. Ga maar. Okay, you can go. Zet die koffers hier maar neer. Just put those suitcases over here.