Hey, I was looking for similar tool before starting building stelvio and I found Chalice. It looked good, it's a nice tool but:

- as you mentioned, seems to be abandoned

- chalice mixes infra code with app code within the file (decorators), stelvio keeps them separate

- in chalice you configure lambdas using json. I strongly believe that everything should be done in python

- chalice is limited to lambda/api/queues, stelvio aims to go further/broader

hope this explains, happy to answer any other questions