SuiteCRM is an open source CRM developed and maintained by SalesAgility, a CRM developer that also offers consulting, migration, and support services. Organizations of all sizes use SuiteCRM, from enterprises to startups to non-profits.

OnePageCRM is an easy to use sales CRM used by sales people and business owners worldwide. Ideal for small to medium sized businesses. Inspired by Getting Things Done (GTD) Productivity principles, you're encouraged to add Next Actions to ensure you always follow up with your prospects.

InsightlyCRM started as a google app. Now InsightlyCRM is a standalone App. Insightly CRM for Small business harnesses the power of Google and Gmail Apps and brings projects and people together in one easy-to-use dashboard. Keep your projects moving and your leads high with a single point of focus to track your clients, projects and pursue an opportunity.

With a limit of 1,000 contacts and 1,000 emails/month, Enagebay CRM suggests its users the cheapest paid plans of the 3 providers. The basic plan will cost you $12 a month per user, and it includes 10,000 contacts and the same amount of emails.

DonorPerfect is a fundraising solution suitable for all nonprofits. It helps users manage donations, contacts, receipting, reporting, email and fundraising initiatives from a single system.

Bitrix 24 provides collaboration management of your CRM software and allows multiple businesses to get started with a free version of this powerful, fully-featured, and all in one platform.

Oracle Sales Cloud offers an array of capabilities built to meet the essential needs of sales organizations. Easy-to-use productivity tools empowers sales with the information and guidance they need to close more deals quickly; “always-on” access even when on the go increases sales teams’ effectiveness and “right-time” insights engenders sales performance.

Wise Agent is an intuitive client influenced CRM and Real Estate software company. Built and loved by agents all over the US, it's no wonder why they're the most coach recommended CRM in the industry. Wise Agent helps Realtor's become Pros by automating their leads, responses, appointments, and transactions -with free training and 24/7 Customer Support included.

amoCRM — is a simple accounting system for potential customers, which will help you to monitor and increase your sales. This online CRM system, is more functional than Excel, but much easier to use than other complex and expensive programs. AmoCRM requires no installation or configuration — just create an account on the website and your personal CRM system is ready for operation.

InSyncTelco is the Best CRM for Small Business that has all the basic capabilities that small businesses need in CRM software, but is also highly ascendible as your business grows up. Moreover, InSyncTelco is one of the most affordable CRM solutions available; there's a free version to help you get started, and paid plans to start at a small part of the price of comparable CRM software.