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Top 20 Python Annotation Projects
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cleanlab
The standard data-centric AI package for data quality and machine learning with messy, real-world data and labels.
Project mention: Ask HN: Not a webdev, why are these sites so good? | news.ycombinator.com | 2024-06-18https://cleanlab.ai/
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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> Does Hypothes.is have a self-hosting option? https://web.hypothes.is/sales/
The code for both the client and server are open source (https://github.com/hypothesis/h) so this is possible. The server is designed to support the needs of large scale deployments, so this does come with some complexity compared to a system you would design for smaller scale usage.
The text on https://web.hypothes.is/ mostly targets schools and universities, because Hypothesis pays for itself by selling integrations with online learning platforms (Canvas, D2L, Blackboard etc.) and associated support.
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diffgram
The AI Datastore for Schemas, BLOBs, and Predictions. Use with your apps or integrate built-in Human Supervision, Data Workflow, and UI Catalog to get the most value out of your AI Data.
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errant
ERRor ANnotation Toolkit: Automatically extract and classify grammatical errors in parallel original and corrected sentences.
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SaaSHub
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globox
A package to read and convert object detection datasets (COCO, YOLO, PascalVOC, LabelMe, CVAT, OpenImage, ...) and evaluate them with COCO and PascalVOC metrics.
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reconstruction-error-ratios
Estimate dataset difficulty and detect label mistakes using reconstruction error ratios!
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Python Annotation discussion
Python Annotation related posts
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Ann, the Small Annotation Server
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Given the rise of LLMs, is a toolkit like ERRANT still relevant?
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Google Sidewiki
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Label Studio: Open-Source Data Labeling Platform
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Best (quickest) way to annotate images for whole-image classification?
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Label Studio – Free multi-type data ML labeling and annotation tool
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Way to label yolov7 images fast
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A note from our sponsor - SaaSHub
www.saashub.com | 18 Jun 2025
Index
What are some of the best open-source Annotation projects in Python? This list will help you:
# | Project | Stars |
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1 | cleanlab | 10,588 |
2 | h | 3,041 |
3 | diffgram | 1,867 |
4 | labelCloud | 690 |
5 | bakta | 519 |
6 | errant | 444 |
7 | bbox-visualizer | 401 |
8 | atlas | 392 |
9 | grasp | 361 |
10 | DLTA-AI | 344 |
11 | spectree | 336 |
12 | globox | 200 |
13 | turkle | 152 |
14 | labelbox-python | 138 |
15 | image-sorter2 | 91 |
16 | ansible-docgen | 75 |
17 | labelformat | 62 |
18 | reconstruction-error-ratios | 25 |
19 | vogon-web | 13 |
20 | active-learning-plugin | 12 |