Snippet manager backed by GitHub Gist (Win/Mac/Linux). It comes with support for unlimited public/private snippets, tags, search, sharing, rich text editor, markdown rendering, dashboard, immersive reading mode, etc.
Ranked in these QuestionsQuestion Ranking
Pro Open source
Lepton is free and open source and is released under the MIT license.
Pro GitHub gist integration
Use GitHub Gist for cross-platform sync.
Pro Language sensitive syntax highlighting
Pro Multi platform support
Supports MacOS, Linux and Windows.
Pro Support for Linux
Provides package in AppImage format which is distribution independent.
Pro Supports markdown
Pro Support for GitHub Enterprise
Pro Lepton refuses any donations in favor of Wikipedia
Pro Supports Jupyter Notebook viewer
Con Built on top of Electron
Electron is a memory hog.
Con Only works with GitHub Gists
As a GitHub Gist client that's not a con (or a problem), but as a snippets manager it is.