Warframe is personally my best free to play game. The developers constantly update their game with the inclusion of new weapons/warframes/sentinels/cosmetics and hotfixes. They are released regularly on Wednesday and always give us players many surprises. Also, the player community is very friendly and every player helps each other with the problems they are facing. Almost every month, there is a major update that includes special events with exclusive rewards such as event mods (double stats), wraith weapons (weapons with special stats and appearance), and also boosters and cosmetics! I really recommend this game and it is one of the best PvE F2P game that you will ever see!