AskKey 1.4 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this free Mac application is Tomoyuki Okawa. We recommend checking the downloaded files with any free antivirus. The software lies within Developer Tools, more precisely Debugging Tools. The most popular version of the tool is 1.4.
From the developer:
AskKey... Find ASCII values, HTML notations, Unicode symbols. AskKey is a simple freeware application that is designed for those who work with ASCII characters and Unicode values. Using ASC/Chr, you can find ASCII values for particular characters or vice versa. Use HTML to find HTML notations for particular keys. Switch to 'Key' and press a key on your keyboard, and AskKey will tell you its ASCII value.
You may want to check out more software for Mac, such as XML-RPC Client, ClippingDetector or Bugz, which might be similar to AskKey.