It doesn’t really matter what web framework to choose for developing a CRM system: ASP.NET, Spring, AngularJS, Express, Symfony, Django or Ruby on Rails. All of them have enough capabilities to make your solution work stable, process data quickly and provide scalability opportunity if necessary.
If you would like your CRM application to display geographical data and maps, we recommend you to go with Djangoframework. It hosts GeoDjango module that connects to PostGIS, which is PostgreSQL’s spatial objects module. Moreover, GDALfor spatial data and PIL for images are rich enough to cover all the needs of geo data displaying.
Since JavaScript is becoming more powerful, we highly recommend to consider using MEAN (Mongo, Express, Angular, Node) stack for programming a CRM app. By using Angular’s Twitter bootstrap plugin, you can create good-looking UI. Node with its multiple modules can manage server part at every step from authentication up to encryption.