some context

hubzilla-context.json

["https://www.w3.org/ns/activitystreams",
 "https://w3id.org/security/v1",
 {
    "zot": "https://social.stephanmaus.de/apschema#",
    "id": "@id",
    "type": "@type",
    "meData": "zot:meData",
    "meDataType": "zot:meDataType",
    "meEncoding": "zot:meEncoding",
    "meAlgorithm": "zot:meAlgorithm",
    "meCreator": "zot:meCreator",
    "meSignatureValue": "zot:meSignatureValue",
    "locationAddress": "zot:locationAddress",
    "locationPrimary": "zot:locationPrimary",
    "locationDeleted": "zot:locationDeleted",
    "nomadicLocation": "zot:nomadicLocation",
    "nomadicHubs": "zot:nomadicHubs",
    "magicEnv": {
      "@id": "zot:magicEnv",
      "@type": "@id"
    },
    "nomadicLocations": {
      "@id": "zot:nomadicLocations",
      "@type": "@id"
    },
    "ostatus": "http://ostatus.org#",
    "conversation": "ostatus:conversation"
 }
]

kroeg-context.json

[
    "https://www.w3.org/ns/activitystreams"
    "https://w3id.org/security/v1",
    {
        "manuallyApprovesFollowers": "as:manuallyApprovesFollowers",
        "sensitive": "as:sensitive",
        "Hashtag": "as:Hashtag",

        "ostatus": "http://ostatus.org#",
        "atomUri": "ostatus:atomUri",
        "inReplyToAtomUri": "ostatus:inReplyToAtomUri",
        "conversation": "ostatus:conversation",

        "toot": "http://joinmastodon.org/ns#",
        "Emoji": "toot:Emoji"
    },
    {
        "jwks": { "@id": "as:jwks", "@type": "@id" },
        "uploadMedia": { "@id": "as:uploadMedia", "@type": "@id" },
        "likes": { "@id": "as:likes", "@type": "@id" },
        "liked": { "@id": "as:liked", "@type": "@id" },
        "shares": { "@id": "as:shares", "@type": "@id" },

        "kroeg": "https://puckipedia.com/kroeg/ns#",
        "unlisted": "kroeg:unlisted",
        "settingsEndpoint": { "@id": "kroeg:settingsEndpoint", "@type": "@id" },
        "relevantObjects": { "@id": "kroeg:relevantObjects", "@type": "@id" },
        "search": { "@id": "kroeg:search", "@type": "@id" },
        "blocks": { "@id": "kroeg:blocks", "@type": "@id" },
        "blocked": { "@id": "kroeg:blocked", "@type": "@id" },

        "c2s": "https://puckipedia.com/kroeg/c2s#",
        "c2s:likes": { "@type": "@id"},
        "c2s:follows": { "@type": "@id"},
        "c2s:announces": { "@type": "@id"},
        "c2s:accepts": { "@type": "@id"},
        "c2s:rejects": { "@type": "@id"},
        "c2s:replies": { "@type": "@id"},
    }
]

mastodon-context.json

[
    "https://www.w3.org/ns/activitystreams",
    "https://w3id.org/security/v1",
    {
      "manuallyApprovesFollowers": "as:manuallyApprovesFollowers",
      "sensitive": "as:sensitive",
      "movedTo": "as:movedTo",
      "Hashtag": "as:Hashtag",
      "ostatus": "http://ostatus.org#",
      "atomUri": "ostatus:atomUri",
      "inReplyToAtomUri": "ostatus:inReplyToAtomUri",
      "conversation": "ostatus:conversation",
      "toot": "http://joinmastodon.org/ns#",
      "Emoji": "toot:Emoji",
      "focalPoint": {
        "@container": "@list",
        "@id": "toot:focalPoint"
      },
      "featured": "toot:featured"
    }
  ]

peertube-context.json

[
  "https://www.w3.org/ns/activitystreams",
  "https://w3id.org/security/v1",
  {
    "RsaSignature2017": "https://w3id.org/security#RsaSignature2017",
    "Hashtag": "as:Hashtag",
    "uuid": "http://schema.org/identifier",
    "category": "http://schema.org/category",
    "licence": "http://schema.org/license",
    "sensitive": "as:sensitive",
    "language": "http://schema.org/inLanguage",
    "views": "http://schema.org/Number",
    "size": "http://schema.org/Number",
    "commentsEnabled": "http://schema.org/Boolean",
    "support": "http://schema.org/Text"
  },
  {
    "likes": {
      "@id": "as:likes",
      "@type": "@id"
    },
    "dislikes": {
      "@id": "as:dislikes",
      "@type": "@id"
    },
    "shares": {
      "@id": "as:shares",
      "@type": "@id"
    },
    "comments": {
      "@id": "as:comments",
      "@type": "@id"
    }
  }
]

pleroma-context.json

[
    "https://www.w3.org/ns/activitystreams",
    "https://w3id.org/security/v1",
    {
      "Emoji": "toot:Emoji",
      "Hashtag": "as:Hashtag",
      "atomUri": "ostatus:atomUri",
      "conversation": "ostatus:conversation",
      "inReplyToAtomUri": "ostatus:inReplyToAtomUri",
      "manuallyApprovesFollowers": "as:manuallyApprovesFollowers",
      "ostatus": "http://ostatus.org#",
      "sensitive": "as:sensitive",
      "toot": "http://joinmastodon.org/ns#"
    }
  ]