I managed to get quite a usable list by sniffing out the versions within the SProcs' source code, as stored within the `sys.comments` tables.

[![enter image description here][1]][1]

A healthy amount of assumptions was made, so **test this code on a solitary test instance first**, before going wild on your multitude of Production servers...

**Edit**: added Adam Machanic's [sp_WhoIsActive](http://WhoIsActive.com) as an example of how to add to this scanner script.

    IF OBJECT_ID('tempdb..##DBA_SProcs') IS NOT NULL
    	DROP TABLE ##DBA_SProcs;
    
    CREATE TABLE ##DBA_SProcs (
    	 DBName				NVARCHAR(100) NULL
    	,SProcName			NVARCHAR (50) NULL
    	,VersionString		NVARCHAR (50) NULL
    	,VersionDateString	NVARCHAR (50) NULL
    	);
    
    EXEC sys.sp_MSforeachdb
    	 @replacechar = N'¬'
    	,@command1 = N'
    USE[¬];
    
    INSERT INTO ##DBA_SProcs
    SELECT
    	 DB_NAME() AS DBName
    	,LTRIM(RTRIM(
    		REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(
    			SUBSTRING([text], CHARINDEX(''sp_Blitz'', [text], 1), 18)
    			,'']'','''')
    			,''('','''')
    			,CHAR(9)/*Tab*/,'' '')
    			,CHAR(10)/*LF*/,'' '')
    			,CHAR(13)/*CR*/,'' '')
    			,''@He'','''')
    		)) AS SProcName
    	,SUBSTRING([text], CHARINDEX(''SET @Version'', [text], 1) + 5, 15) AS VersionString
    	,SUBSTRING([text], CHARINDEX(''SET @VersionD'', [text], 1) + 5, 24) AS VersionDateString
    FROM sys.syscomments sc
    WHERE sc.[text] LIKE ''%sp_Blitz%''
      AND sc.[text] LIKE ''%SET @Version%'';
    
    INSERT INTO ##DBA_SProcs
    SELECT
    	 DB_NAME() AS DBName
    	,''sp_WhoIsActive'' AS SProcName
    	,SUBSTRING([text], CHARINDEX(''Who Is Active? v'', [text], 1) + 15,  7) AS VersionString
    	,SUBSTRING([text], CHARINDEX(''Who Is Active? v'', [text], 1) + 23, 10) AS VersionDateString
    FROM sys.syscomments sc
    WHERE sc.[text] LIKE ''%sp_WhoIsActive%''
      AND sc.[text] LIKE ''%Who Is Active? v%'';
    ';
    
    SELECT *
    FROM ##DBA_SProcs
    ORDER BY 1
    
    IF OBJECT_ID('tempdb..##DBA_SProcs') IS NOT NULL
    	DROP TABLE ##DBA_SProcs;

  [1]: https://i.sstatic.net/euPyO.png