I have made a messaging application! 
It runs off of PHP scripts that you can find right here. If a person does not have a mac, they can go to the URL and the “index” has a small field for message and name, and below that is the messages.
The script is below.
property username : missing value
property website : missing value
on run
asklogin(false)
repeat
set messages to do shell script "curl " & website & "veiw?mode=get |textutil -format html -convert txt -stdin -stdout"
if messages is "Messages:" then set messages to "No messages."
repeat
if messages contains "404 Not Found" then
set website to missing value
asklogin(true)
set messages to do shell script "curl " & website & "veiw?mode=get |textutil -format html -convert txt -stdin -stdout"
else
exit repeat
end if
end repeat
set message to display dialog messages & return & return & "---" & return & return & "What message do you want to send?" default answer "Hello." buttons {"Change Settings/Quit", "Send"} default button "Send" giving up after 30
if not gave up of message then
if button returned of message is "Change Settings/Quit" then
display dialog "What do you want to do?" buttons {"Clear Chat", "Reset Settings", "Quit"} default button "Quit" cancel button "Quit"
if button returned of result is "Reset Settings" then
set {website, username} to {missing value, missing value}
asklogin(false)
else if button returned of result is "Clear Chat" then
set thepass to text returned of (display dialog "What is the password?" default answer "" default button "OK")
do shell script "curl -d \"pass=" & thepass & "\" " & website & "clear.php"
end if
else
set message to text returned of message
do shell script "curl -d \"message=" & message & "&name=" & username & "\" " & website & "post.php?web=applescript"
end if
end if
end repeat
end run
on asklogin(o)
if o then
if website is missing value then set website to text returned of (display dialog "What website do you want to chat on?\n\t(this site has to have the appropriate files) AN ERROR HAS OCCURED" default answer "" default button 2)
if username is missing value then set username to text returned of (display dialog "What do you want your username to be?" default answer "" buttons {"OK"} default button 1)
else
if website is missing value then set website to text returned of (display dialog "What website do you want to chat on?\n\t(this site has to have the appropriate files)" default answer "" default button 2)
if username is missing value then set username to text returned of (display dialog "What do you want your username to be?" default answer "" buttons {"OK"} default button 1)
end if
if website does not end with "/" then set website to website & "/"
end asklogin
NOTE: To clear the chat, navigate to the “chat.php” page and insert “pass123” (unless changed in the file) and it should do it, or you can do it inside of the messaging application script…