Yes, we're getting along
The below is a statement from the joint effort of the Xsera and Antares teams.
Xsera is a project being developed by Adam Hintz, Alistair Lynn, Andrew Moscoe, and Scott McClaugherty, with the help of Nick Farley, Taylor Vaughan, Steven Edwards, and Chris Pickel. We plan to make many enhancements to Xsera over the original Ares, along with allowing the user to experience the old game if they wish. Antares is being worked on by Chris "Pallas Athene" Pickel.
Xsera is being built from scratch, while Antares is using Nathan Lamont's released source code. This causes a few rather important differences to pop up:
Xsera and Apollo will be available under the MIT license, while Antares is required to use the GPL license, having used Mr. Lamont's original code. The MIT license is much less restrictive than the GPL - for instance, users of Xsera will be able to modify it and sell it, if they can create a good enough project (for example, if you did a total conversion, you could legally use Xsera and the Apollo engine, for free, to sell your product). The GPL requires that any products made from Antares be non-commercial in nature (you can't sell them), along with a number of other restrictions - so in order to sell your game, you would need to separately relicense the code from Mr. Lamont.
(MIT license used for Xsera - GPL 2.0 license for the released Ares code, and subsequently for Antares (with human readable version) - Creative Commons BY NC SA 3.0 for most of Ares' media - Creative Commons BY NC ND 3.0 for the Ares movies)
This competition is good for you, the end user: two products are coming from different angles to acheive a similar goal. When both products are complete, you will be able to try them both out for free - there's not many competing software titles out there like this. We're not angry at the other team (although that would be somewhat hard to do, as Pallas Athene is helping out on the Xsera project as well as his own Antares), and we will keep relations friendly between the two projects - there's no reason for us to to have any ill-will towards the other team.
Feel free to ask any questions you have, we will answer them to the best of our abilities.