Hi Xiaoxu, MPICH is open source with a very permissive software license. You should be able to use it in your application without restrictions. I don't think you need the letter of support. Regards, -- Hui ________________________________ From: Diao, Xiaoxu via devel <[email protected]> Sent: Friday, October 6, 2023 10:45 AM To: [email protected] <[email protected]> Cc: Diao, Xiaoxu <[email protected]> Subject: [mpich-devel] Asking for a letter of support Dear Sir/Madam, My name is Xiaoxu Diao. I am a research associate at The Ohio State University. We are in the process of developing a proposal for an SBIR/STTR program. We are planning to use your library (MPICH) in our application. Please let us know whom we should contact to obtain a formal letter of support indicating support for the use of your library during the Phase I development of our application. We would appreciate it if we could receive your response before 10/7/2023. Thank you. Best regards, Xiaoxu Diao