Riseup is a volunteer-run collective providing secure email account, email list, VPN, online chat, and other online services.

SendX provides growth tools and email marketing automation platform at affordable price to grow your web business.

EmailOctopus is an email marketing software.

Google Groups is a service from Google that provides discussion groups for people sharing common interests.

Dada Mail is a web-based electronic mailing list management system that can be used for announcement lists.