| AudioSendable | A sendable that represents an arbitrary file. |
| CustomSendable | A customizable data object. |
| FileSendable | A sendable that represents an arbitrary file. |
| MiniclipSendable | |
| ObjTypes | Well-known types used throughout the system. |
| PictureSendable | Represents a sendable picture. |
| RdlSendable | Represents a "Rich Deep Link" (RDL) that can be sent to a feed. |
| SendUtils | A factory for creating various types of senable messages. |
| StickerSendable | |
| StreamNotificationSendable | |
| TextSendable | Represents a text message. |