I put together an updated list of Android apps that support the OKAPI http://www.opencaching.us/okapi/introduction.html
Columbus by Vladimír Bučko - https://play.google.com/store/apps/deta ... g.columbus
GeoCaching Buddy by BtStSoft - https://play.google.com/store/apps/deta ... buddy.view
OpenCaching for Android by b64 - https://play.google.com/store/apps/deta ... hing&hl=en
Opencaching QuickFind by Wojciech Rygielski - https://play.google.com/store/apps/deta ... roadrunner (use this as a plugin for other apps like Locus and GCBuddy)
c:geo by c:geo team - https://play.google.com/store/apps/deta ... geocaching (Currently accessing via xml, OKAPI coming soon)
Feel free to respond with any additions and I'll update this post.