Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Fetchee - Fetchee is a free price tracking wish list app that works with all online stores worldwide.
Brevo - Innovative online Email Marketing solution to manage your contacts, create & send your newsletters and track your results. More than 80 000 clients. Best prices and attractive features.
Keepa - Price history charts and the option to be alerted on price drops for all Amazon sites.
Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.