amoCRM is the world's first messaging-powered CRM. Multi-channel communication lets you converse through messengers, emails, and calls from a single app. Now every interaction with your customers can be a personalized one-on-one dialogue. Plus managers love its powerful analytics, reporting, and automation tools. It's the perfect messenger-based sales solution for entrepreneurs and SMBs.
Qiqqa is by far the strongest solution for research and managing pdf's. Zotero, named as a comparison is weak as it does not allow pdf;s to be loaded into its interface - you need to use a pdf reader, which defeats its whole purpose. With Qiqqa documents in a library can be searched together. It has excellent maps of your libraries. It is not prefect, having a few glitches, but still is the only one of its kind.
Pipedrive - Sales pipeline software that gets you organized. Helps you focus on the right deals, so easy to use that salespeople just love it. Great for small teams.
Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
HubSpot CRM - Free CRM software for small businesses.
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Keap - Grow Sales. Save Time. Get Organized.
JabRef - Graphical Java application for managing bibtex (. bib) databases.JabRef · JabRef Help · JabRef | Blog · OpenOffice/LibreOffice .