SourceForge has launched the Language Lab, an AI-powered digital English language platform for schools, colleges and training institutes. Unlike traditional MP3-and-headset labs, the platform listens to every student utterance — transcribing it with OpenAI's open-source Whisper model, scoring it phoneme-by-phoneme against an accent-specific reference, and surfacing targeted feedback to the student in seconds while presenting the teacher with a live batch-level weakness map.
The product covers all four English skills — speaking, listening, reading and writing — through a four-layer architecture. AI services are implemented as a FastAPI Python microservice running PyTorch, Transformers, spaCy and librosa, with Whisper served from a single NVIDIA T4 or RTX 4060 GPU box that can support around 40 concurrent students. The NestJS API layer handles business logic across 26 modules including authentication, courses, lessons, quizzes, assessments, certificates and analytics, with multi-tenant isolation under a Tenant → Department → Batch → Student hierarchy.
Accent is a first-class configuration parameter — American, British and Indian English reference models ship out of the box, so a student saying "theatre" the Indian way is not marked down for not sounding American. The conversation partner is a curriculum-bound GPT-4 chat agent with prompt templates per grade and topic, scoring the student's grammar and fluency live while staying inside the lesson scope. AI content generation produces complete lessons — reading passage, comprehension MCQs, vocabulary list, discussion prompts and listening audio via Google neural TTS — from a topic and a grade level in roughly thirty seconds.
The product is in production at an engineering college with 4,200 students and is in pilot at a fourteen-school K-12 chain serving 18,000 students. On-premise deployment from a single Docker Compose file makes it viable in school server rooms with patchy internet, with only the optional GPT-4 conversation partner and Google TTS requiring outbound connectivity.