Update the top-level README.
runtimes-common
=============
-Common tools and scripts for building GCP runtimes.
+This repository contains common tools and scripts for working with containers.
-* If you're looking for the container structure tests, check out our [new dedicated repo](https://github.com/GoogleCloudPlatform/container-structure-test).
+The primary use is for small tools used to build, test and distribute container images by GCP engineers, although other users might find them useful as well.
+
+**If you're looking for the container structure tests, check out our [new dedicated repo](https://github.com/GoogleCloudPlatform/container-structure-test).**
+
+## Projects
+
+Projects in this repo are mainly organized in sub-directories.
+
+See below for a list of the tools contained here.
+
+* [FTL](./ftl/) - A set of tools for building language-runtime focused images "faster-than-light".
+* [Integration Tests](./integration_tests/) - A set of tools for testing the functionality of language-based application containers on GCP.
+* [reconciletags](./reconciletags/) - A source-based workflow tool for managing the tags on container images in GCR.
+* [runtime_builders](./runtime_builders) - A tool for releasing sets of container images.
+* [check_if_image_tag_exists](./check_if_image_tag_exists/) - A Container Builder step to help prevent overwriting images.
+* [containerregistry testing](./testing/) - A Python library for testing containerregistry.
+
+## Developing
You'll most likely need the `bazel` tool to build the code in this repository.
Follow these instructions to install and configure [bazel](https://bazel.build/).
