Free Sugar/Vtiger/VTE Comparison - Customer Management and Sales tools

Customer Management Tools	VTECRM	VTIGER	SUGAR
Leads module	yes	yes	yes
Accounts module	yes	yes	yes
Contacts module	yes	yes	yes
Visit Report module	yes	no	no
Lead conversion to Account/Contact/Opportunity	yes	yes	yes
Lead conversion to other objects (note, call, task...)	no	no	yes
Creating a contact from vCard	no	no	yes
Mapping customized fields for Lead conversion	yes	yes	no
Accounts hierarchy	yes	yes	yes
History of activities and communication	yes	yes	yes
Address geolocation on map	yes	yes	no

The equipment for the management of potential and actual customers is basically the same. All three Sugar, Vtiger and VTE make a distinction between the company and the person: Leads, Organizations/Accounts and Contacts modules. The Lead conversion is automatic (through a button) and the fields, if mapped, move into the new objects. Only Sugar allows to convert a Lead into something else (a note, a call, a task…) but in the other hand it does not allow the customized field mapping.
Features in common are: activities and communication (emails) can be saved and attached to the customer sheet; a hierarchy of companies (like headquarter and branches) can be defined by specific fields.
In VTE and Vtiger, addresses can be geolocated on map. VTE has also a module called Report Visit. Sugar provides a nice feature: creating a new contact from a vCard.

Sales & Administration tools	VTECRM	VTIGER	SUGAR
Opportunities/Potentials module	yes	yes	yes
Quotes module	yes	yes	no
Sales Orders module	yes	yes	no
Purchase Orders module	yes	yes	no
Invoices module	yes	yes	no
Delivery Notes module	yes	no	no
Vendors module	yes	yes	no
Forecast tools on opportunities	no	no	no
Quick guided creation of quote>order>invoice... by steps	yes	yes	no
Detailed product rows	yes	yes	no
Individual/group tax modality	yes	yes	no
Exporting and printing quotes/orders/invoices	Pdf, Rtf	Pdf	no
Customized PDF templates	yes	no	no
Recurring invoices	yes	yes	no

The sales & administration area is very similar and complete in Vtiger and VTE, while in Sugar is almost absent. Sugar offers only the Opportunity module: sadly, there is nothing more to say about it.
For the other two software, the modules involved are Opportunities, Quotes, Sales Orders, Invoices, Delivery Note (VTE only), Vendors and Purchase Orders. Both systems have a quick, pre-compiled creation of these steps (for example: I generate a Sale Order from a Quote, the CRM automatically shows me the content and I have just to modify it if necessary). Both allow me to compile a detailed product row with description, comment, quantity, discounts, taxes, etc.
Neither Vtiger nor VTE have forecast tools, like information about competitors, profit margin, budget, etc.
With both system I can print the documents in PDF format. The only remarkable difference is that VTE allows me to customize a limited number of print templates, while Vtiger does not at all.

Read all the comparison work about Sugar/Vtiger/VTE free edition 

The comparison work is based on

SUGAR 6.5 COMMUNITY
VTIGER FREE 6.3
VTECRM COMMUNITY 15.05
All three the versions are free and downloadable from their official sites.