Add project: InvoiceFlowAI

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## Basic info

**Application name**: InvoiceFlowAI
**Application repo link**: https://github.com/EthanYoQ/Invoice-Downloader
**Application home link**: https://www.orz.md/invoice-downloader/
**Application description**: Desktop application that collects PDF, OFD, and XML invoices from a user's QQ or 163 mailbox, performs OCR-assisted extraction and classification, and generates an Excel reimbursement summary while leaving uncertain results for human review.

## Qualifications

- [x] Free software with an online source repository.
- [x] Using Python for a considerable part of its functionality.
- [x] Well-known, or at least prominently used in an identifiable niche.
- [x] Maintained or otherwise demonstrably still functional on relevant platforms.
- [x] An application, not a library or framework.

## Additional notability info

I maintain InvoiceFlowAI and am submitting it for maintainer evaluation.

The application is Apache-2.0 licensed, has 301 GitHub stars, and provides current Windows x64 and macOS Apple Silicon installers. Python is the repository's primary language and implements the mailbox, invoice-processing, OCR, classification, and reporting workflow.

Its identifiable niche is Chinese electronic-invoice collection and reimbursement preparation: it handles PDF, OFD, XML, and selected invoice download links from QQ and 163 mailboxes, then produces categorized files and an Excel summary. Low-confidence results remain available for human review rather than being presented as accounting or tax conclusions.

The project was featured in issue 410 of the Chinese-language Technology Enthusiast Weekly: https://www.ruanyifeng.com/blog/2026/08/weekly-issue-410.html

Latest release: https://github.com/EthanYoQ/Invoice-Downloader/releases/latest

Review the existing application entries in the awesome-python-applications repository and the submitted InvoiceFlowAI links first. Confirm the project's Python usage, license, maintenance, and application fit against the repository's criteria; done means the maintainers can accept the project as a properly documented list entry.

Written by the indexing model from the issue text.