The Best Octopus Alternatives in 2026

Create wireframes and user flow prototypes with Wireflow, a free online design tool.

Chart Builder creates charts from CSV or TSV data, including pie, bar, line, area, scatter, and donut charts.

Charts Builder creates and customizes charts through the Google Charts API, with output code available to copy.

CASCII provides an open-source ASCII diagram builder written in JavaScript, according to its page description.

Datawrapper creates interactive charts, maps, and tables in a web app without requiring code, according to its site.

SIMILE Exhibit helps publish data-rich web pages through a framework for presenting information.

Edotor provides a web-based editor for creating and editing Graphviz diagrams.

pygal provides Python tools for creating charts and visualizing data in applications.

Pie Chart Maker creates customizable pie charts and lets users download them as JPG, PNG, or SVG files.

RAWGraphs is a free, open-source tool for creating data visualizations.

Flowgorithm provides a flowchart-based programming language, with multilingual navigation and learning resources on its homepage.

Bar, line, area, and scatter charts can be created with dimple, an open-source charting API for D3.js.

DiagramGPT generates diagrams from text prompts, with the project page describing diagram workflows for teams.

QuickChart generates chart images through an API that can embed visualizations in emails, reports, and other platforms.

Flourish creates charts, maps, and interactive content for data storytelling without requiring coding.

Use AnyChart, a JavaScript charting library, with its chart types and API documentation.

Vega-Altair provides declarative data visualization tools for Python applications.

For custom data visualizations in JavaScript, D3.js provides tools for scales, axes, transitions, and DOM updates.

Swimlanes.io creates sequence diagrams from text in a browser and lets users download diagrams or share them through links.

More than 50 chart types and modules are available in ZingChart, a JavaScript library for data visualization projects.

ParaView analyzes and visualizes data across settings ranging from laptops to supercomputers, according to its project site.

amCharts provides JavaScript charting components, maps, stock charts, and Gantt charts.

SankeyMATIC builds flow diagrams for comparing quantities across stages, with examples covering budgets, results, and processes.

Bokeh creates interactive plots, dashboards, and data applications in Python.