Librelist is described as 'free as in freedom mailing list site for open source projects. It is a place for FOSS communities to discuss all the things they want without ads, censorship, signup requirements, bundled apps, or requirements that you use any particular email client or service'. There are four alternatives to Librelist, not only websites but also apps for a variety of platforms, including Python, Self-Hosted solutions, Solaris and BSD. The best alternative is Google Groups, which is free. Other great sites and apps similar to Librelist are Mailman (Free, Open Source), Framalistes (Free, Open Source) and FreeLists (Free, Open Source).
Google Groups is all about helping users connect with people, access information, and communicate effectively over email and on the web. Now theres a new version on the block. We didnt want to say it, but yes, its new and improved.