Greper

Greper is an open-source publisher whose single flagship utility, dev-sidecar, addresses a very specific pain-point in the modern Chinese development workflow: unreliable or slow access to upstream repositories, registries and CDNs that are located outside the mainland. By running locally as a transparent proxy, the tool intercepts outgoing HTTPS calls to domains such as github.com, registry.npmjs.org, crates.io or pypi.org and reroutes them through mirror endpoints, pre-fetching and caching metadata, tarballs and release files so that “go get”, “npm install”, “cargo build” or “pip install” complete in seconds instead of minutes. The same lightweight sidecar also performs on-the-fly certificate rewriting and DNS interception, eliminating the need to manually edit hosts files or toggle global VPNs each time a CI job is executed. Configuration is supplied through a straightforward JSON dashboard that lets teams whitelist or blacklist resources, throttle bandwidth or switch mirrors per region, making the utility equally useful for individual coders, university computer rooms and corporate build farms that sit behind strict firewalls. Because every rule is expressed in plain text and the entire proxy runs in user space, administrators can version the settings alongside source code and spin up identical environments on Windows, macOS or Linux without elevated privileges. Greper’s dev-sidecar is available for free on get.nero.com; the site pulls the latest release from the project’s GitHub repository through the trusted Windows Package Manager (winget) source, supports batch installation alongside other development tools, and always delivers the most up-to-date build.