Yireo runs a Gitlab instance to maintain the source code of the commercial LokiCheckout modules. Because of this, any issue that is related to the source code, should also be filed as an Issue within Gitlab. Additionally, access to Gitlab allows you to browse all of the source code as well.
If you already have access, head over to https://gitlab.yireo.com/ and login with your own credentials.
Once you're in, you will get an overview of groups under Groups. Usually you're just seeing the Loki Checkout group.
Within the Loki Checkout group, there are numerous projects (aka Git repositories aka Magento modules) to be visited. Note that some repositories are also located on GitHub.