Skaffold is an open-source project created by Google. It provides a development framework for Kubernetes-based applications. This framework creates a fast, repeatable, and simple local Kubernetes workflow. Put simply, this means that it handles all the hard bits of managing a cloud-native local development environment, such as building images and deploying to Kubernetes. With Skaffold handling the hard bits, you save time with every iteration you make in development.
Telepresence is an open-source tool created by Ambassador Labs. Telepresence makes Kubernetes developers super productive by letting them code as if their laptop is in their Kubernetes cluster. This way you can query cluster resources and experiment rapidly with other services in real-time.