Procedia Computer Science. Elsevier.
From about this journal:
Launched in 2009, Procedia Computer Science is an electronic product focusing entirely on publishing high quality conference proceedings. Procedia Computer Science enables fast dissemination so conference delegates can publish their papers in a dedicated online issue on ScienceDirect, which is then made freely available worldwide.
Only ten (10) volumes but open access.
The Proceedings of the International Conference on Computational Science, 2010, 2011, 2012, are all 2,000+ pages. With two hundred and twenty-five (225) articles in the 2012 volume, I am sure you will find something interesting.
Don’t neglect the other volumes but that’s where I am starting.