Alternativas ao LekkerIM para Windows S com licença de código aberto

• Windows S
  Todas as plataformas Windows Mac Linux Chrome OS Android iPhone Windows Phone Blackberry Apple Watch Android Wear iPad Android Tablet Windows S Web Self-Hosted Software as a Service (SaaS) PHP JavaScript Python BSD Wordpress PortableApps.com Slack Electron / Atom Shell Discord Cloudron ZeroNet Go (Programming Language)
• Licença Open Source
  Qualquer licença Licença gratuita Licença Open Source Licença comercial