I work on perspective, glad you dig it! We just released 1.0 this week after 4+ years of open-source-first development.

Perspective was, in a previous life, a proprietary internal engine for Python/desktop applications at JPMC, that was ported and open-sourced to FINOS as a web assembly based browser component. Open sourcing perspective had a huge impact on the project, not just from the awesome community contributions and engagement and support from FINOS itself, but (as a huge surprise to me) the perspective project's visibility within our company.