Yudit-2.7.6. Open Type Support
Whenever there is a font that needs support for
some table it can be added:

swindow/SFontOTF.cpp:
#define PRINT_UNSUPPORTED 1
#define PRINT_UNDEBUGGED 1

This will print out the unsupported formats in
a particular font.
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GSUB
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1 Single Substitution
1.1 Format-1 YES 
1.2 Format-2 YES

2 Multiple Substitution
2.1 Fomrat-1 NO 

3 Alternate Substitution
3.1 Fomrat-1 PARTIAL (as Contextual Substitution Reference) 

4 Ligature Substitution   
4.1 Format-1 YES 

5 Contextual Substitution   
5.1 Simple         NO
5.2 Class-Based    YES 
5.3 Coverage-Based NO 

6  Chaining Contextual Substitution   
6.1 Simple         NO
6.2 Class-Based    YES
6.2 Coverage-Based YES

7  Extension Substitution   
7.1 Fomrat-1 NO 

8 Reverse Chainin Contextual Single Substitution
8.1 Coverage-Based NO

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GPOS
================================================
1 Single Adjustment
1.1 Format-1 NO 
1.2 Format-2 NO 

2 Pair Adjustment
2.1 Format-1 NO 
2.2 Format-2 NO - Undebugged

3 Cursigne Attachment
3.1 Format-1 NO 

4 MarkToBase Attachment
4.1 Format-1 YES 

5 MarkToLigature Attachment
5.1 Format-1 NO 

6 MarkToMark Attachment
6.1 Format-1 YES 

7 Contextual Positioning
7.1 Simple         NO 
7.2 Class-Based    NO 
7.3 Coverage-Based NO 

8 Chaining Contextual Positioning
8.1 Simple         NO 
8.2 Class-Based    NO  - Undebugged
8.3 Coverage-Based NO 

9 Extension Positioning
9.1 Formta-1       NO