When it comes to writing a book or producing official documentation, you need to know that you’re using the official logs, and your publisher will often look for due diligence of that there aren’t any issues with using/republishing the logos. There is the added bonus that the official logos tend to be made available with transparent backgrounds and usually include high-quality versions of the images.

There are a couple of common answers to this – trawl the project’s official gitHub repo and the vendor (or primary sponsoring vendor’s website – usually part of the PR resources). This takes time, so below are links to the logos I’ve found myself needing.

Product / Project / Service / Organization	Notes	Example Logos
ANSI	T&Cs not aligned to any common licensing
Apache Projects	Apache project logos have a dedicated web page bringing all the logos together. (Except Log4J aka Apache Logging Services which are best found in the GitHub repo). ASF’s press kit has the Apache Feather logo. The logos can typically be found in the Apache Git hub repos in the docs folder. With the Project tagged as being covered by the Apache 2 license.
AWS	AWS Architecture icons, service logos, and the trademark rules declarations()
CNCF Projects	Most CNCF projects, both current and archived, can be found in CNCF’s GitHub repo – and their brand guidelines. The repo
Docker	Docker logos download and guidelines on use. Legal statements.
Eclipse Foundation	Podman logos are in the GitHub repo for Podman, which is covered by the Apache 2 license.
Google (GCP)	GCP Services, core Product logos, and policies and Go Lang image and rules
GraalVM
Grafana	Grafana Lab’s rules and Grafana logo, Loki,
Micronaut	Logos and rules
Microsoft	Azure architecture icons
MongoDB	MongoDB policies and graphics
OpenJDK	Java’s Duke & Duchess (part of OpenJDK)
OpenSearch	Logos and rules
Oracle	– Architecture diagram templates, icon files, etc. – Oracle corporate rules regarding branded logos – this includes Java and MySQL – Java’s Duke & Duchess (part of OpenJDK) – MySQL
Podman	Podman logos are in the GitHub repo for Podman which is covered by the Apache 2 license.
Postgres
Postman	Podman logos are in the GitHub repo for Podman, which is covered by the Apache 2 license.
Python Foundation	Logos and rules
Redis
Slack	Media kit and legal words.
Spring	This just covers the core brand logo (images and trademark use). There is no reference to the different project logos like Spring Boot on the main page. Project logos are typically in their Git Hub project repo docs – therefore, subject to that repo’s licensing.