Open source alternatives for GMAIL

Gmail is one of the best mail services electronic devices that exist today, in addition to having an account opens the doors to other Google services, such as Blogger, GDrive, Docs, Calendar, Hangouts, synchronizations for your mobile devices with Android, etc. But it is not the only alternative to Hotmail / Outlook and other services such as Yahoo, there are also others and open source.

All the alternatives that we are going to present, being open source, they allow greater freedom and some of them have very different options than the ones we are used to in Google mail. Among the alternatives that we present are the following: 

• roundcube: is a modern mail client installed on a LAMP server (Linux Apache MySQL and PHP). It contains a simple interface and is fast. It also allows translation in up to 70 languages, agenda, templates, API to create extensions, etc.
• Zimmer: Another interesting alternative, its interface seems somewhat primitive, but it is an interesting idea to use it as it is an all-in-one solution, with a web mail client and mail server. It is well maintained and has been used by organizations and corporations.
• Squirrel Mail: developers describe it as "webmail for nuts". It is a client that does not have as many options as other modern clients, but it is simple and straightforward. It is a fairly mature project, since it has been in operation since 1999.
• rain loop: It has a very elaborate interface, which has little to envy others such as Gmail. It has many features that you expect in an email, it also integrates with Facebook, Twitter, GOogle and Dropbox to offer a better experience.
• Kiting: It was created to compete face to face with Gmail, in fact it can be considered a clone of Gmail. If you are used to Gmail perhaps it is the best option, but it has a problem and that is that its development seems stagnant. Despite not receiving updates for a year, it is still worth it ...

By supuesto there are more, such as HastyMail (an old mail client written in PHP and under the GPL license), Mailpile (HTML5 and Python under AGLP, focused on privacy and speed), WebMail Lite (modern and minimalist, under AGPL license and written in PHP) , and a long etc.