Similar projects and alternatives to polymesh-wallet
Node for Polymesh Blockchain
Repository for cryptographic libraries used in Polymesh (by PolymathNetwork)
Scout APM - Leading-edge performance monitoring starting at $39/month. Scout APM uses tracing logic that ties bottlenecks to source code so you know the exact line of code causing performance issues and can get back to building a great product faster.
Polymesh Developer AMA - June 9, 10, & 11 2021
reddit.com/r/PolymathNetwork | 2021-06-09
As you say the Polymesh UIs / dApps are typically not open-source - they do use the open-source SDK under the covers though. Our SDK has example projects and documentation available at https://developers.polymesh.live/ and any on-chain transaction is mediated through the Polymesh Wallet, which is open-source at https://github.com/PolymathNetwork/polymesh-wallet.