BoneCP is a Java JDBC connection pool implementation that is tuned for high performance by minimizing lock contention to give greater throughput for your applications. It currently beats all known connection pools, including C3P0 and DBCP, as shown on the benchmark section on the site.
Vibur DBCP is a concurrent, fast, and fully-featured JDBC connection pool based on Java dynamic proxies. It supports a fairness parameter, statement caching, Hibernate integration, and SQL queries logging, among other features. Various configuration examples (with Spring, Hibernate, etc.) are provided.