BlockExplorer Software from GitHub :
https://github.com/bitcoin-abe/bitcoin-abe (https://bitcointalk.org/index.php?topic=22785.0)
https://github.com/lirazsiri/blockexplorer
https://github.com/CallMeJake/BlockCrawler
https://bitcointalk.org/index.php?topic=20430.0
a securecoin blockexplorer based on abe . github fork included:
https://bitcointalk.org/index.php?topic=292965.0