It seems another porting company is starting to work on more and more Linux ports and the year has only just begun! Virtual Programming are working on Arma: Cold War Assault [Steam] and Frog Climbers [Steam] in addition to the already announced Putty Squad.
All three games are listed as being in "beta", but no word from VP about any of them as far as release dates are concerned. The only one they have confirmed elsewhere is Putty Squad which they mentioned a few times on Twitter. It seems they like to keep it quiet by noting it mainly on their website.
It's nice to see older games coming onto Linux, as I've always said a back catalogue of games is important to have and not just brand new releases.
Hopefully VP will announce even more Linux ports as the year continues on, so I look forward to seeing what else they will bring to Linux.
You can see on their official website their expanded in-development section.
Thanks for pointing it out in the GOL IRC channel uso!