While regular Gmail is free and perhaps will be, but all Google Apps are no more free. Google made some changes effective from December 6, 2012 for Google Apps users. If you use Google business email, Google drive, sites, Google calendar, and online docs @your_company[dot]com, then here is something you need to know. Google is no longer accepting new sign-ups for the free version of Google Apps (the version you’re currently using). If you’re already a customer, this change has no impact on your previous service, and you can continue to use Google Apps for free.
GeeMail is a Desktop client for Gmail. You can access gmail outside the browser. This is very useful if your internet browser has been corrupted or you just want to access Gmail by using desktop software and not the internet browser. This is an email client but you do not need to configure POP and IMAP settings for it. Being offline won’t stop you from using Gmail if you are using this email client. You can compose email and hit send. When you go live, the email will be sent immediately. Its got the same interface as Gmail. You do not need to learn any new thing about it and its cross platform.