The first blockexplorer was actually created by theymos:
https://bitcointalk.org/index.php?topic=1727.0. This was before blockexplorer.com and it led to the creation of that which was a lot more polished and with more detailed information.
Today I learned that theymos developed the first ever block explorer. I didn't knew that, the amount of significant role he is playing or played for the Bitcoin community is underrated and not much appreciated. Although, he has been single handedly running this forum from years. Thank you for your contribution @theymos. We all appreciate it and if you ever need anyone's help, do let us know.