Ktechlab 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
I found ktechlab and QUCS, both of them are Open Source. Source: about 2 years ago
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