Author of Monica/Chandler here. Thanks for posting this. As others have pointed out, we are rewriting Monica from scratch, codename Chandler: https://github.com/monicahq/chandler We've also written OfficeLife, an open source tool to manage your employees: https://github.com/officelifehq/officelife , yet to be released. I think we have too many ideas and side projects :-)
Chandler has not only already been used for another piece of software, it has been used for something in what is roughly the same space. The other Chandler was discontinued >10 years ago, but I had to double check and triple check to suss out whether or not your Chandler is actually a reboot + a rewrite. And I'm still hedging (but I think the answer is "no, they're completely separate"). That's a confusing amount of similarity.
EDIT: it looks like this has been pointed out. Even though it's "just" a codename, I'd recommend changing it to something like "chauncey" or "bingaling" or "miss-bong" or "skidmark" or something.