The best alternatives to Bowtie are Tabler, Blur Admin, and Netlify CMS. If these 3 options don't work for you, we've listed a few more alternatives below.
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Agree.com— Free e-signature for everyone with invoicing and payments!
Everything your end-users need to manage their workspace in one integration, including authorization and authentication features and a customer-facing layer that allows them to gain full control over their accounts usage.