Featured replacement
Open-source alternatives to paid software
Replacement Apps
Updated 19 Oct 2026
Free and open-source projects built to replace paid software. Each entry lists what it replaces, what that costs, and how the stock of the company behind it has moved.Free and open-source alternatives to paid software, with prices and company stock moves.
- Projects listedProjects
- 431
- Companies coveredCompanies
- 239
- Publicly tradedPublic
- 50
- Yearly list price replacedYearly cost
- $80,816
Stock prices as of 20 Oct 2026
Updated 19 Oct 2026
All replacements
Every free replacement in the indexLoading…
Public companies
One-year daily close for every listed company whose product appears in the index. Dotted lines mark replacements that launched in the past year. Select a ticker to filter the list.
How it's built
What gets into the index, what the labels mean, and where the numbers come from.
A project qualifies when it is free to use (or free with optional paid services) and is built to stand in for a specific commercial product people pay for. Each entry names that product, its current list price for a single user, and the company behind it.
Entries come from project repositories, launch posts and press coverage, linked at the bottom of every entry. Where a fact could not be confirmed, the entry says so instead of guessing.
Reading the prices
The struck-through price is the paid product's published monthly or annual price for one person, before tax and discounts. The yearly figure converts monthly plans at twelve months. One-time licenses are shown as sold and are not converted.
REA (Reverse Engineer Anything) is an MIT-licensed server and command-line tool that lets coding agents inspect software they don't have the source for: native binaries through Ghidra, IDA or Hopper, plus Electron apps, .NET assemblies, Android packages and websites. It is an independent project, not made by the companies behind those agents.
Lookalike repos. Copies of REA that offer a "free download zip" for Windows have circulated. The official source is github.com/morluto/rea.
Daily closing prices from Yahoo Finance, split-adjusted, for the twelve months to the most recent close shown in the totals above. "Since launch" compares the first close on or after a project's launch date with the latest close. Projects launched more than a year ago show no since-launch figure.
Launch markers show timing only. A clone's launch is rarely the reason a large company's share price moves, and nothing here is investment advice.
Reverse engineering and reimplementation are legal in many places for interoperability, but license terms and local law vary. Each project is responsible for its own clean-room process.