Cardstack's technology was discussed in a recent update on Card Folio:
What Cardstack tools were used in the development of the Card Folio demo (4 Edges etc.)?
Card Folio uses the following Cardstack modules:
Cardstack Hub as an orchestration server for synthesizing on-chain transaction data, third-party currency exchange data, and local user portfolio preferences data
Ethereum plugin for full indexing of Ethernet mainnet transactions, to support instantaneous retrieval of any arbitrary address and its transaction history
Git and GitHub plugin for storing and retrieving users’ personal portfolio settings and wallet address data
Card-based APIs for creating and nesting assets, wallets, transactions, portfolios, and user identity schema, logic and templates
Server-side computed properties to correlate and compute mathematical formulas on an event-driven basis
PostgreSQL-based continuous indexing, using search engine-style retrieval for fast rendering of views with many aggregates
Continuous integration (CI) and Terraform-based automated deployment pipeline for Amazon Web Services (AWS)
Additional middleware capabilities
from
https://medium.com/cardstack/community-q-a-the-card-folio-app-c07125a2e18d