Kexi might be a bit more popular than Copper. We know about 1 link to it since March 2021 and only 1 link to Copper. 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.
I've seen Copper CRM work quite well for contractors (assuming that your team is using or open to using Google Workspace - if you're not using Google Workspace, I'd probably ask why not? But then recommend you to use Pipedrive if you're not willing to switch to Google Workspace). Source: over 1 year ago
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
Zoho CRM - Omnichannel CRM for Businesses of all sizes
Microsoft Office Access - Access is now much more than a way to create desktop databases. It’s an easy-to-use tool for quickly creating browser-based database applications.
Pipedrive - Sales pipeline software that gets you organized. Helps you focus on the right deals, so easy to use that salespeople just love it. Great for small teams.
LibreOffice - Base - Base, database, database frontend, LibreOffice, ODF, Open Standards, SQL, ODBC
Freshsales CRM - A full-fledged CRM for high-velocity sales teams.
My Visual Database - Using My Visual Database, you can create databases for invoicing, inventory, CRM, or any specific purpose.