Commercial Libraries
PLJukebox
Plausible Jukebox provides a clone of Apple's CoverFlow™ user interface for the iPhone, using only public, documented APIs.
Open Source Libraries
PLActorKit
ActorKit provides an Objective-C implementation of asynchronous inter-thread message passing to facilitate the implementation of concurrent software on both the desktop (Mac OS X) and embedded devices (iPhone OS).
PLBlocks
Plausible Blocks implements runtime and compiler support for C and Objective-C Blocks on Mac OS X 10.5 and iPhone OS 3.0. PLBlocks is based entirely on Apple’s block runtime and compiler additions for Snow Leopard.
PLCrashReporter
Plausible CrashReporter provides an in-process live crash reporting framework for use on both the iPhone and Mac OS X. Crash reports are output as protobuf-encoded messages, and may be decoded using the CrashReporter library or any Google Protobuf decoder.
PLDatabase
An SQL database access library for Objective-C, initially focused on SQLite as an application database. The library supports Mac OS X, iPhone, and Windows (via Cocotron).
MDB-SQLite
Provides automated conversion of MS Access 2000 databases to SQLite on any platform, utilizing cross-platform Java libraries — No native driver required.