For the first week of our project, I have inspected some sources related to HLA based RTI implementations, done some market search and looked for intelligent agents a little bit. Of course most of our effort is given to brainstorming during this process, because "what" to implement is still a larger question than "how" to implement, before giving out an SRS.
I see no need to explain concepts like what HLA standard stands for, for which purpose RTI is used, etc., but I want to share some useful sources that we (or you, if you are interested in similar topics) can use in future development steps. The first one is Portico, a fully supported, open source, cross-platform HLA RTI implementation. You can get more info from http://porticoproject.org/ . It is well documented and open source, however it is better to keep in mind that, to use a tool that is more preferred and suggested by sponsors may be well-integrated and ease our work.