Herramientas de comunicación
Con mayor frecuencia:  — Telegram — WhatsApp (desgraciadamente ya que la gran mayoría lo usa) Con menor frecuencia: — Riot (Matrix) — Elements — Jitsi Meet — Googe Meet y Skype  — Otras que tengo en cuenta: — Signal — XMPP (CoyIM, Gajim)  — Jami — Discord  — Big Blue Button……

Chats y videollamadas
  1. Telegram https://telegram.org/ (open source)
  1. Elements https://element.io/ (open source)
  1. Wire https://wire.com/en/ (open source)
  1. Threema https://threema.ch/ (open source)
  1. Retro Share https://retroshare.cc/
  1. Slient Circle https://www.silentcircle.com/
  1. Line https://line.me
  1. Twin Me https://twin.me


Únicamente chats
  1. Session https://getsession.org/ (open source)
  1. Signal https://www.signal.org/ (open source)
  1. Briar https://briarproject.org/ (open source)
  1. Conversations https://conversations.im/ (open source)
  1. Ricochet https://www.ricochetrefresh.net/ (open source)
  1. CoyIM  https://coy.im/ (open source)
  1. XMPP https://xmpp.org/ (open source)
  1. HexChat https://hexchat.github.io/ (open source)
  1. Pidgim https://www.pidgin.im/ (open source)
  1. ICQ https://www.icq.com/ (open source)
  1. Weechat https://weechat.org/ (open source)
  1. Jam https://jam.systems/ Salas de audio  (open source)
  1. Speek https://github.com/Speek-App/Speek (open source)
  1. SureSpot  https://www.surespot.me/
  1. KeyBase https://keybase.io/
  1. Gitter https://gitter.im/
  1. OTR.im Chat https://otr.im/chat.html 
  1. Rocket Chat https://rocket.chat/es/ 
  1. DeltaChat https://delta.chat/es/
  1. Gajim https://gajim.org/ 

Chats grupales
  1. Riot Matrix  https://about.riot.im/ (open source)
  1. Revolt https://revolt.chat/ (open source)
  1. Discord https://discordapp.com/ (open source)
  1. Zulip  https://zulip.com/ (open source)
  1. Elements https://element.io/ (open source)
  1. OnionShare https://onionshare.org/
  1. Mattermost https://mattermost.com/