Scorp check out TAPATALK. Installs serverside. Is free, but only 5$ a month for the unbranded, 10$ GIM branded. I go to a couple of forums with my tablet and phone using it. Clean fast and very neat. I installed the free ver. on my forum years ago. Never had a serious complaint. Most if not all problems were on the user side.
Tapatalk offers free iOS and Android app for your members. For a small monthly fee ($10/mo) you can also create your own branded community app - and we get the your branded apps published in Google Play and Apple App Store.