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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
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marlowe
Prototype implementation of domain-specific language for the design of smart-contracts over cryptocurrencies
As for how to develop for them now, you can still spin up your own "testnet"-esque systems in the meantime using Mallet. Mallet supports IELE and KEVM.
Both of those have offline dev environments that you can pull down and play with at https://github.com/input-output-hk/plutus and https://github.com/input-output-hk/marlowe respectively. The upside is that the behaviour on-chain vs the behaviour in the testing environments should be identical due to the formal models constraining the behaviour.
Both of those have offline dev environments that you can pull down and play with at https://github.com/input-output-hk/plutus and https://github.com/input-output-hk/marlowe respectively. The upside is that the behaviour on-chain vs the behaviour in the testing environments should be identical due to the formal models constraining the behaviour.