Deep playground - Deep playground is an interactive visualization of neural networks, written in typescript using d3.

Netron - Open-source visualizer for neural network, deep learning and machine learning models.

Neural Designer - Neural Designer is a high performance data science and machine learning platform.

Neuroph - Neuroph is lightweight Java neural network framework to develop common neural network architectures.

Neuronify - An educational neural network app.

KNIME - KNIME, the open platform for your data.