Sparrow is described as 'minimalist mail application for Mac. It was designed to keep things simple and efficient. No fancy stuff here... just your mail and nothing else' and is a popular app in the Office & Productivity category. There are more than 25 alternatives to Sparrow for a variety of platforms, including Mac, Windows, Linux, iPhone and iPad. The best alternative is Thunderbird, which is both free and Open Source. Other great apps like Sparrow are K-9 Mail (Free, Open Source), Microsoft Office Outlook (Paid), Mailbird (Paid) and eM Client (Freemium).
KMail is the email component of Kontact, the integrated personal information manager of KDE. Kontact is a personal information manager and groupware software suite for KDE. It supports calendars, contacts, notes, to-do lists, news, and email.
Kontact is the integrated Personal Information Manager of KDE. Kontact suite unites mature and proven KDE PIM applications under one roof. Thanks to the powerful KPart technology, existing applications are seamlessly integrated into one.
TypeApp is an all-free, beautifully designed, universal email app, capable of managing unlimited number of mail accounts from various providers, allowing for smart push notifications while enabling personalization across multiple email accounts.
myMail is the smart email app for managing all your accounts on iOS and Android. Use myMail to manage messages in your Gmail, Hotmail, Live, Outlook, Yahoo, MSN, iCloud and AOL email accounts at once. The app also supports any IMAP and POP3-enabled mailbox.