Although, it's worth noting that most OG Xbox homebrew (that I know of, at least) was made using leaked official SDKs (XDK), not open-source reverse engineered

Although, it's worth noting that most OG Xbox homebrew (that I know of, at least) was made using leaked official SDKs (XDK), not open-source reverse engineered SDKs. IMO the PSP's homebrew community was the best without relying on leaked SDKs - the open source PSPSDK is very good and was used in lieu of leaked SDKs by almost all homebrew authors.