Easily create & deliver documents, presentations & reports in Word, PowerPoint, Excel, HTML email & PDF forms from any standard/custom object. Generate proposals, account plans, invoices, quotes, contracts & more. NEW for 2015: Integrates with Salesforce1 as well.
Nanostuffs would have probably used Conga Composer with 40% of our all customers, its the most popular tool to create Merged Documents. For Invoices, Billing, Reports, etc. We have grown quite good expertise on number of ways we can tweak & create as customized document you want out of Salesforce.comKnow More About Conga Composer