One of the main benefits of our EspoCRM software is that it’s fully customizable. We strive to create a solution that fits different business and industry needs, without having to rely on a “one size fits all” approach or make you spend a fortune on customization. You can create new fields, add them to existing forms, link entities with each other or even create your own entity. More Info »
*EpsoCRM is totaly free to use (distributed under GPLv3) with no limitation by size, customizations and amount of users.*
They offer different packs of addons to extend the free version. (one-time-fee)
For example if you want to automate your processes, you can buy an addon
that includes a drag-and-drop workflow extention.
Feel free to try the demo: http://demo.espocrm.de/advanced/
If you need help visit the documentation: https://www.espocrm.com/documentation/
or visit the very friendly Forum: https://forum.espocrm.com/