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+# Technical Stack - Open Source Technologies for Maternal Organization App
+
+## Mobile Application Development
+
+### Cross-Platform Framework
+- **React Native** (Primary Choice)
+  - `react-native`: Core framework
+  - `react-native-cli`: Command line interface
+  - `expo`: Development toolchain and libraries
+  - `react-navigation`: Navigation library
+  - `react-native-paper`: Material Design components
+  - `react-native-elements`: UI toolkit
+
+### Alternative Native Development
+- **Flutter** (Alternative Option)
+  - `flutter`: Core SDK
+  - `flutter_bloc`: State management
+  - `provider`: Dependency injection
+  - `get_it`: Service locator
+  - `dio`: HTTP client
+
+### State Management
+- **Redux Toolkit**
+  - `@reduxjs/toolkit`: Modern Redux with less boilerplate
+  - `react-redux`: React bindings
+  - `redux-persist`: Offline data persistence
+  - `redux-offline`: Offline-first functionality
+  - `redux-saga`: Side effects management
+
+### Local Database & Storage
+- **SQLite** (Primary local database)
+  - `react-native-sqlite-storage`: SQLite for React Native
+  - `typeorm`: Object-relational mapping
+  - `realm`: Alternative mobile database
+  
+- **Async Storage**
+  - `@react-native-async-storage/async-storage`: Key-value storage
+  - `react-native-mmkv`: Fast key-value storage alternative
+
+## Backend Infrastructure
+
+### Core Backend Framework
+- **Node.js** with **NestJS**
+  - `@nestjs/core`: Enterprise-grade Node.js framework
+  - `@nestjs/common`: Common utilities
+  - `@nestjs/platform-express`: Express adapter
+  - `@nestjs/microservices`: Microservices support
+  - `@nestjs/websockets`: WebSocket support
+  - `@nestjs/graphql`: GraphQL integration
+
+### API Development
+- **GraphQL**
+  - `apollo-server-express`: GraphQL server
+  - `type-graphql`: TypeScript GraphQL framework
+  - `graphql-subscriptions`: Real-time subscriptions
+  - `graphql-upload`: File upload handling
+  
+- **REST API**
+  - `express`: Web framework
+  - `fastify`: Alternative high-performance framework
+  - `cors`: Cross-origin resource sharing
+  - `helmet`: Security headers
+  - `compression`: Response compression
+
+### Database Systems
+- **PostgreSQL** (Primary database)
+  - `pg`: PostgreSQL client
+  - `knex`: SQL query builder
+  - `prisma`: Modern ORM
+  - `typeorm`: Alternative ORM
+  
+- **MongoDB** (Document storage)
+  - `mongoose`: MongoDB object modeling
+  - `mongodb`: Native driver
+
+### Caching & Performance
+- **Redis**
+  - `redis`: Redis client
+  - `ioredis`: Advanced Redis client
+  - `bull`: Queue management
+  - `node-cache`: In-memory caching
+  
+- **Elasticsearch** (Search & analytics)
+  - `@elastic/elasticsearch`: Official client
+  - `searchkit`: Search UI components
+
+## AI & Machine Learning
+
+### LLM Integration (Proprietary APIs)
+- **OpenAI API** / **Anthropic Claude API** / **Google Gemini API**
+- **LangChain** (Framework)
+  - `langchain`: Core library
+  - `@langchain/community`: Community integrations
+  - `@langchain/openai`: OpenAI integration
+
+### Open Source ML/AI
+- **TensorFlow.js**
+  - `@tensorflow/tfjs`: Core library
+  - `@tensorflow/tfjs-node`: Node.js bindings
+  - `@tensorflow/tfjs-react-native`: React Native support
+  
+- **ONNX Runtime**
+  - `onnxruntime-node`: Node.js inference
+  - `onnxruntime-react-native`: Mobile inference
+
+### Natural Language Processing
+- **Natural**
+  - `natural`: General NLP tasks
+  - `compromise`: Natural language understanding
+  - `sentiment`: Sentiment analysis
+  - `franc`: Language detection
+
+### Pattern Recognition & Analytics
+- **Time Series Analysis**
+  - `timeseries-analysis`: Time series forecasting
+  - `simple-statistics`: Statistical functions
+  - `regression`: Regression analysis
+  
+- **Data Processing**
+  - `pandas-js`: Data manipulation
+  - `dataframe-js`: DataFrame operations
+  - `ml-js`: Machine learning algorithms
+
+## Real-Time Communication
+
+### WebSocket & Real-Time Sync
+- **Socket.io**
+  - `socket.io`: Server implementation
+  - `socket.io-client`: Client library
+  - `socket.io-redis`: Redis adapter for scaling
+
+### Push Notifications
+- **Firebase Cloud Messaging** (Free tier available)
+  - `firebase-admin`: Server SDK
+  - `react-native-firebase`: React Native integration
+  
+- **Alternative: Expo Push Notifications**
+  - `expo-notifications`: Notification handling
+  - `expo-server-sdk`: Server implementation
+
+## Voice & Audio Processing
+
+### Voice Input & Recognition
+- **Whisper** (OpenAI's open source)
+  - `whisper`: Speech recognition
+  - `react-native-voice`: Voice recognition wrapper
+  
+- **Web Speech API**
+  - `react-speech-kit`: React speech components
+  - `speech-to-text`: Browser-based recognition
+
+### Audio Processing
+- **FFmpeg**
+  - `fluent-ffmpeg`: Node.js wrapper
+  - `react-native-ffmpeg`: Mobile integration
+  
+- **Web Audio API**
+  - `tone.js`: Audio synthesis and effects
+  - `wavesurfer.js`: Audio visualization
+
+## Security & Privacy
+
+### Authentication & Authorization
+- **Supabase** (Open source Firebase alternative)
+  - `@supabase/supabase-js`: Client library
+  - `@supabase/auth-helpers`: Authentication utilities
+  
+- **Passport.js**
+  - `passport`: Authentication middleware
+  - `passport-jwt`: JWT strategy
+  - `passport-local`: Local strategy
+
+### Encryption & Security
+- **Cryptography**
+  - `bcrypt`: Password hashing
+  - `jsonwebtoken`: JWT tokens
+  - `crypto-js`: Encryption utilities
+  - `node-forge`: Cryptography toolkit
+  
+- **Security Middleware**
+  - `helmet`: Security headers
+  - `express-rate-limit`: Rate limiting
+  - `express-validator`: Input validation
+  - `hpp`: HTTP parameter pollution prevention
+
+### COPPA/GDPR Compliance
+- **Age Verification**
+  - `age-calculator`: Age calculation utilities
+  - Custom implementation required
+  
+- **Data Privacy**
+  - `anonymize`: Data anonymization
+  - `gdpr-guard`: GDPR compliance helpers
+
+## File & Media Management
+
+### Image Processing
+- **Sharp**
+  - `sharp`: High-performance image processing
+  - `react-native-image-resizer`: Mobile image resizing
+  - `react-native-image-picker`: Image selection
+
+### File Storage
+- **MinIO** (Self-hosted S3-compatible)
+  - `minio`: Object storage server
+  - `multer`: File upload middleware
+  - `multer-s3`: S3 storage engine
+
+### Document Processing
+- **PDF Generation**
+  - `pdfkit`: PDF generation
+  - `puppeteer`: HTML to PDF conversion
+  - `react-native-pdf`: PDF viewing
+
+## Calendar & Scheduling
+
+### Calendar Integration
+- **Calendar Libraries**
+  - `node-ical`: iCal parsing
+  - `ical-generator`: iCal generation
+  - `react-native-calendars`: Calendar components
+  - `react-big-calendar`: Web calendar component
+
+### Scheduling
+- **Cron Jobs**
+  - `node-cron`: Task scheduling
+  - `agenda`: Job scheduling
+  - `bull`: Queue-based job processing
+
+## Integration Libraries
+
+### External Service Integrations
+- **Google APIs**
+  - `googleapis`: Google services client
+  - `@react-native-google-signin/google-signin`: Google sign-in
+  
+- **Microsoft Graph**
+  - `@microsoft/microsoft-graph-client`: Graph API client
+  
+- **School Platforms**
+  - Custom API integrations required
+  - `axios`: HTTP client for API calls
+
+### Smart Home Integration
+- **Home Assistant**
+  - `home-assistant-js-websocket`: WebSocket client
+  
+- **Voice Assistants**
+  - `ask-sdk`: Alexa Skills Kit
+  - `actions-on-google`: Google Assistant
+
+## Data Visualization & Analytics
+
+### Charting Libraries
+- **D3.js Ecosystem**
+  - `d3`: Core visualization library
+  - `react-native-svg`: SVG support for React Native
+  - `victory-native`: React Native charts
+  
+- **Chart.js**
+  - `chart.js`: Charting library
+  - `react-chartjs-2`: React wrapper
+  - `react-native-chart-kit`: React Native charts
+
+### Analytics
+- **Matomo** (Open source analytics)
+  - `matomo-tracker`: Analytics tracking
+  
+- **PostHog** (Open source product analytics)
+  - `posthog-js`: JavaScript client
+  - `posthog-react-native`: React Native client
+
+## Development Tools
+
+### Testing Frameworks
+- **Unit Testing**
+  - `jest`: Testing framework
+  - `@testing-library/react-native`: React Native testing
+  - `enzyme`: Component testing
+  
+- **E2E Testing**
+  - `detox`: React Native E2E testing
+  - `appium`: Cross-platform mobile testing
+  - `cypress`: Web testing
+
+### Code Quality
+- **Linting & Formatting**
+  - `eslint`: JavaScript linter
+  - `prettier`: Code formatter
+  - `husky`: Git hooks
+  - `lint-staged`: Pre-commit linting
+
+### Development Environment
+- **Build Tools**
+  - `webpack`: Module bundler
+  - `babel`: JavaScript compiler
+  - `metro`: React Native bundler
+  
+- **Development Servers**
+  - `nodemon`: Node.js auto-restart
+  - `concurrently`: Run multiple commands
+  - `dotenv`: Environment variables
+
+## DevOps & Infrastructure
+
+### Container Orchestration
+- **Docker**
+  - `docker`: Containerization
+  - `docker-compose`: Multi-container apps
+  
+- **Kubernetes** (for scaling)
+  - `kubernetes`: Container orchestration
+  - `helm`: Kubernetes package manager
+
+### CI/CD
+- **GitHub Actions** / **GitLab CI** / **Jenkins**
+  - `semantic-release`: Automated versioning
+  - `standard-version`: Changelog generation
+
+### Monitoring & Logging
+- **Sentry** (Open source error tracking)
+  - `@sentry/node`: Node.js SDK
+  - `@sentry/react-native`: React Native SDK
+  
+- **Winston** (Logging)
+  - `winston`: Logging library
+  - `morgan`: HTTP request logger
+
+### Message Queue
+- **RabbitMQ**
+  - `amqplib`: RabbitMQ client
+  
+- **Apache Kafka** (for high scale)
+  - `kafkajs`: Kafka client
+
+## Additional Utilities
+
+### Date & Time
+- `dayjs`: Lightweight date library
+- `date-fns`: Date utility library
+- `moment-timezone`: Timezone handling
+- `react-native-date-picker`: Date picker component
+
+### Forms & Validation
+- `react-hook-form`: Form management
+- `yup`: Schema validation
+- `joi`: Object schema validation
+- `react-native-masked-text`: Input masking
+
+### Localization
+- `i18next`: Internationalization framework
+- `react-i18next`: React integration
+- `react-native-localize`: Device locale detection
+
+### Utilities
+- `lodash`: Utility functions
+- `uuid`: UUID generation
+- `validator`: String validators
+- `numeral`: Number formatting
+
+## Infrastructure Services (Self-Hosted Options)
+
+### Backend as a Service
+- **Supabase** (Complete backend solution)
+- **Appwrite** (Alternative BaaS)
+- **Parse Server** (Mobile backend)
+
+### Search Infrastructure
+- **Meilisearch** (Fast search engine)
+- **Typesense** (Typo-tolerant search)
+
+### Email Service
+- **Nodemailer** with SMTP
+- **SendGrid** (Free tier available)
+- **Postal** (Self-hosted)
+
+## Performance Optimization
+
+### Mobile Performance
+- `react-native-fast-image`: Optimized image loading
+- `react-native-super-grid`: Efficient grid rendering
+- `recyclerlistview`: High-performance lists
+- `react-native-reanimated`: Smooth animations
+
+### Backend Performance
+- `cluster`: Node.js clustering
+- `pm2`: Process management
+- `compression`: Response compression
+- `memory-cache`: In-memory caching
+
+## Accessibility Tools
+- `react-native-accessibility`: Accessibility utilities
+- `react-native-tts`: Text-to-speech
+- `react-native-screen-reader`: Screen reader detection
+
+## Development Recommendations
+
+### Minimum Viable Stack
+1. **Frontend**: React Native + Expo
+2. **Backend**: NestJS + PostgreSQL
+3. **Real-time**: Socket.io
+4. **AI**: OpenAI/Claude API + LangChain
+5. **Auth**: Supabase Auth
+6. **Storage**: MinIO/Supabase Storage
+7. **Cache**: Redis
+8. **Search**: Meilisearch
+
+### Scalability Considerations
+- Start with monolithic backend, prepare for microservices
+- Use message queues early for async operations
+- Implement caching strategy from day one
+- Design for offline-first mobile experience
+- Plan for horizontal scaling with Kubernetes
+
+### Security Priorities
+- Implement end-to-end encryption for sensitive data
+- Use JWT with refresh tokens
+- Apply rate limiting on all endpoints
+- Regular security audits with OWASP tools
+- COPPA/GDPR compliance from the start