Apps similar to Spider include Progressive Web Apps for Firefox, which is free and open source. Other options are Quick Web Apps and Web Apps. In total there are three Application Launchers like Spider for Linux, Mac and Windows.
Progressive Web Apps (PWAs) are web apps that use web APIs and features along with progressive enhancement strategy to bring a native app-like user experience to cross-platform web applications. Although Firefox supports many of Progressive Web App APIs, it does not support...
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Quick Web Apps written with love and libcosmic. Turn Any URL into a Web App, running in a separate window of any browser installed on your system, selected according to your preference. Integrates with your desktop environment (icon pinnable to the dock).
Install websites as desktop apps, so that they appear in their own windows separate from any browsers installed. Links to websites other than the one installed open in a new browser window. This is similar to the "Install as App" feature found in popular web browsers.
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