WorkEtc is a CRM and collaboration suite, combining features of client management, project management and billing in one. It is very aggressively priced ($359/mo gives you only 3 users) and comes with a limit on how many contacts you can have in your database even in the top plan. If you are looking for a free WorkEtc alternative that comes with more sales and collaboration tools, source code and lets you choose between cloud and self-hosted options, Bitrix24 is likely the best choice.
* Please note that the information may have changed since the publication. For current prices and features please visit Bitrix24 pricing page.