Grok Bot just shipped Doc Merger, a multi-file aggregation tool that handles Google Docs, Word, PDFs, and plain text.

Core functionality:
- Ingests entire folders, outputs unified PDF + HTML/Word/TXT variants
- Auto-generates indexed TOC with source file tracking
- Checkpoint-based resumption, so interrupted 400-doc merges don't restart from zero
- Source count verification with explicit failure logging

Technical edge: most merge tools are single-file or manual. This one handles bulk ingestion at scale with state persistence, which matters when you're consolidating research archives, book drafts, or client deliverables that span hundreds of documents.

Practical use cases:
- Compile fragmented blog posts into manuscript-ready output
- Create single-file project archives for handoff or compliance
- Prep clean, consolidated context windows for LLM ingestion instead of feeding 300 separate files

Free to use. Built because scattered knowledge bases are a workflow tax most tools ignore.