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Really Simple Systems CRM
Really Simple Systems helps track your sales, leads, manage your contact lists, automate your marketing campaigns, and provide excellent customer service. Everything is conveniently located in one place, so you can always keep track of what's going on.
Zulip is an open source group chat application. It provides a full-featured chat interface for asynchronous and real-time discussions, with a focus on simplicity, flexibility, and power.