CEUR-WS.org (CEUR Workshop Proceedings) publishes computer-science workshop proceedings as open-access for free, i.e. without article processing charge (APC). This allows workshop organizers to quickly publish their proceedings. New workshops in computer science are popping up almost every week. They are accelerators of leading edge research in our field. While large conferences and journals rightfully emphasize rigid reviewing, they cannot react so quickly to changes in the academic dialogue as workshops can do. Conferences aim for persistence. Workshops are more short-lived. They pop up, thrive, and disappear when the subject has become mainstream.
So, if you want to learn about the latest trends and results in computer science, then have a look at the recently published volumes at CEUR-WS.org!