.atom/init.coffee

# maximize window on startup
atom.maximize()

config.cson (Startup empty workspace + GUI + editor settings)

  core:
    openEmptyEditorOnStart: false
    restorePreviousWindowsOnStart: false
    themes: [
      "atom-dark-ui"
      "base16-tomorrow-dark-theme"
    ]
  editor:
    fontSize: 13
    invisibles: {}
    nonWordCharacters: "/\\()\"':,.;<>~!@#%^&*|+=[]{}`?-…"
    preferredLineLength: 100
    showIndentGuide: true
    tabLength: 4
    zoomFontWhenCtrlScrolling: false
  welcome:
    showOnStartup: false

Packages:

switch-header-source (.*)\.(js|ts|html)$
block-select
multi-cursor-plus
atom-beautify
autocomplete-plus
linter-eslint
pinned-tabs

goto (File symbols: CTRL+R, Project symbols: CTRL+SHIFT+R, Search files: CTRL+T)
atom-ctags
docblockr
language-lua
project-manager
zentabs
omnisharp-atom (only for c# projects)