The Best Free Tools & Platforms to Practise Machine Learning Skills in 2025/26
Machine learning (ML) has become one of the most in-demand career paths in technology. From predicting customer behaviour in retail to detecting fraud in banking and enabling medical breakthroughs in healthcare, ML is transforming industries across the UK and beyond.
But here’s the truth: employers don’t just want candidates who have read about machine learning in textbooks. They want evidence that you can actually build, train, and deploy models. That means practising with real tools, working with real datasets, and solving real problems.
The good news is that you don’t need to pay for expensive software or courses to get started. A wide range of free, open-source tools and platforms allow you to learn machine learning skills hands-on. Whether you’re a beginner or preparing for advanced roles, you can practise everything from simple linear regression to deploying deep learning models — at no cost.
In this guide, we’ll explore the best free tools and platforms to practise machine learning skills in 2025, and how to use them effectively to build a portfolio that UK employers will notice.
Why Practising Machine Learning Skills is Essential
Machine learning is practical. To succeed in the field, you need to move beyond theory. Hands-on practice helps you:
Understand algorithms deeply: Implementing a decision tree or neural network teaches you more than reading about it.
Work with real-world data: Handling messy, unbalanced, or incomplete datasets builds problem-solving skills.
Gain confidence for interviews: Many ML interviews involve coding tasks or explaining how you’d approach a problem.
Showcase a portfolio: Recruiters want to see GitHub projects, Kaggle notebooks, or dashboards that prove your ability.
Stay current: ML evolves quickly. Free tools often release updates that expose you to the latest methods.
1. Google Machine Learning Crash Course
Google’s ML Crash Course is one of the best free introductions to machine learning.
Key Features
25+ lessons, 30+ exercises, real-world case studies.
Interactive visualisations and coding labs.
Covers supervised learning, neural networks, and practical tips.
Why It’s Useful
It provides both theory and hands-on labs, making it an ideal starting point for beginners.
2. Scikit-learn
Scikit-learn is the most popular free Python library for classical machine learning.
Key Features
Algorithms for regression, classification, clustering, and dimensionality reduction.
Tools for model evaluation and preprocessing.
Excellent documentation and tutorials.
Why It’s Useful
It’s the perfect toolkit for building foundational ML skills before moving to deep learning.
3. TensorFlow
TensorFlow is Google’s open-source deep learning framework.
Key Features
Supports neural networks, reinforcement learning, and generative models.
Scales from laptops to cloud platforms.
TensorFlow Lite supports deployment on edge devices.
Why It’s Useful
TensorFlow is widely used in industry, making it valuable for employability.
4. PyTorch
PyTorch is the preferred framework for researchers and many industry practitioners.
Key Features
Dynamic computation graph, flexible and Pythonic.
Strong ecosystem for deep learning research.
TorchVision for computer vision tasks.
Why It’s Useful
PyTorch is often listed in job descriptions alongside TensorFlow. Knowing both is a big advantage.
5. LightGBM
LightGBM is a gradient boosting framework from Microsoft.
Key Features
Fast and memory-efficient.
Excellent for structured/tabular data.
Free and open source.
Why It’s Useful
Boosted trees are among the most competitive algorithms in data science competitions and real jobs.
6. XGBoost
XGBoost is another high-performance gradient boosting library.
Key Features
Regularised boosting to reduce overfitting.
Widely used in Kaggle competitions.
Open source and free.
Why It’s Useful
Still one of the top performers for structured datasets.
7. Neural Network Intelligence (NNI)
NNI is Microsoft’s free toolkit for AutoML and hyperparameter tuning.
Key Features
Automates model selection and tuning.
Supports PyTorch, TensorFlow, and Scikit-learn.
Free and open source.
Why It’s Useful
Learning hyperparameter tuning and AutoML is key for scaling your skills.
8. OpenML
OpenML is an open platform for sharing datasets, models, and experiments.
Key Features
Thousands of free datasets.
Experiment tracking and reproducibility.
Integration with Python and R.
Why It’s Useful
It’s a treasure trove for practising with real data.
9. Kaggle
Kaggle is one of the best platforms for practising ML at any level.
Key Features
Competitions with real datasets.
Free hosted notebooks with GPUs.
Datasets and kernels from the community.
Why It’s Useful
Kaggle projects look fantastic on a CV and help you build a visible portfolio.
10. Google Colab
Colab is a free cloud-based notebook environment.
Key Features
Pre-installed ML libraries.
Free GPU/TPU access.
Easy sharing with Google Drive.
Why It’s Useful
Colab removes the need for powerful local hardware.
11. RStudio & R Packages
For learners using R, RStudio is the leading free IDE.
Key Features
Open-source desktop edition.
Packages like caret, randomForest, and tidymodels.
Posit Cloud free tier for cloud-based projects.
Why It’s Useful
R is still highly valued in statistics-heavy roles like healthcare or finance.
12. MLflow
MLflow is an open-source tool for managing ML lifecycles.
Key Features
Experiment tracking.
Model packaging.
Deployment across platforms.
Why It’s Useful
Experience with MLflow helps you practise MLOps skills.
13. DVC (Data Version Control)
DVC extends Git for managing datasets and ML models.
Key Features
Version control for large files.
Integrates with cloud storage.
Free and open source.
Why It’s Useful
It’s a practical way to manage data pipelines in ML projects.
14. CVAT (Computer Vision Annotation Tool)
CVAT is an open-source annotation tool for vision datasets.
Key Features
Label images and video.
Supports multiple annotation formats.
Web-based interface.
Why It’s Useful
If you want to work in computer vision, CVAT helps you prepare datasets.
15. Imbalanced-learn
Imbalanced-learn is a Python library for handling imbalanced datasets.
Key Features
Over-sampling and under-sampling methods.
Works with Scikit-learn.
Free and open source.
Why It’s Useful
Many real datasets are imbalanced, and this library helps you address that challenge.
16. Infer.NET
Infer.NET is Microsoft’s framework for probabilistic programming.
Key Features
Bayesian inference and probabilistic modelling.
Open source under MIT licence.
Works with .NET languages.
Why It’s Useful
A good choice for research and advanced ML use cases.
17. Free Data Sources
You’ll need data to practise ML. Top free sources include:
Kaggle Datasets.
OpenML.
UCI Machine Learning Repository.
UK Government Open Data (data.gov.uk).
World Bank Open Data.
Why They’re Useful
Real datasets make your projects more relevant to employers.
18. MOOCs & Learning Platforms
Many platforms offer free ML content:
edX: Audit mode is free for top university ML courses.
Coursera: Free trials and previews (Andrew Ng’s ML course).
Fast.ai: Free deep learning course.
Great Learning: Free ML and AI courses with certificates.
Why They’re Useful
They blend theory with practical exercises, often using free tools.
19. Visualisation Tools
Tableau Public: Free visualisation software for sharing dashboards.
Power BI Desktop: Free for personal use.
Matplotlib & Seaborn: Free Python libraries.
Why They’re Useful
Visualisation is critical for explaining ML results to non-technical audiences.
20. Communities & Peer Learning
Machine learning is easier with peer support. Join:
Reddit (r/MachineLearning, r/learnmachinelearning).
Discord & Slack ML groups.
LinkedIn ML communities.
Meetups in the UK.
Why They’re Useful
Networking helps you troubleshoot problems, share knowledge, and find job leads.
Project Ideas to Build Your Portfolio
Here are some free projects you can build with the tools above:
Predict house prices: Use Kaggle datasets with Scikit-learn.
Sentiment analysis: Train a text classifier in Colab.
Image recognition: Build a CNN using TensorFlow or PyTorch.
Fraud detection: Apply LightGBM to financial datasets.
Customer segmentation: Use clustering algorithms on retail data.
Upload these projects to GitHub and document them well — they can make your CV stand out.
How to Use These Tools Effectively
Start with foundations: Learn Scikit-learn and SQL first.
Move to deep learning: Explore TensorFlow or PyTorch.
Experiment with AutoML: Try NNI or Auto-Sklearn.
Manage data and models: Use DVC and MLflow.
Add visualisation: Build dashboards in Tableau Public or Power BI.
Build projects: Start small but aim for real-world relevance.
Document and share: Post notebooks on Kaggle or GitHub.
Engage with community: Get feedback, iterate, and improve.
Final Thoughts
Machine learning is one of the most exciting fields to work in, and the UK job market is full of opportunities. Employers want candidates who don’t just understand the theory but who can prove practical ability.
With the free tools outlined here — from Scikit-learn, TensorFlow, and PyTorch to Kaggle, Colab, and MLflow — you have everything you need to practise machine learning without spending a penny. Add in free datasets, MOOCs, and annotation tools, and you can create portfolio projects that make you stand out.
So don’t wait. Open Colab, choose a dataset, and start building your first model today. Your machine learning career starts with practice.
