C-Organizer might be a bit more popular than Kexi. We know about 1 link to it since March 2021 and only 1 link to Kexi. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
LibreOffice Base (which I tried several years ago) and KEXI (which I haven't tried) are some free/open-source alternatives. They may help get you started in what you're looking to build. Source: over 2 years ago
Perhaps something like https://csoftlab.com/c-organizer ? Source: over 1 year ago
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