NSData

NSData+Base64

+ (NSData *)dataFromBase64String:(NSString *)aString;
- (NSString *)base64EncodedString;

NSString

NSString+HTML

- (NSString *)stringByConvertingHTMLToPlainText;
- (NSString *)stringByDecodingHTMLEntities;
- (NSString *)stringByEncodingHTMLEntities;
- (NSString *)stringWithNewLinesAsBRs;
- (NSString *)stringByRemovingNewLinesAndWhitespace;

UIColor

UIColor+DigitalColorMeter

+(UIColor*)colorWithDigitalColorMeterString:(NSString*)digitalColorMeterColorString;

UIImage

UIImage+resize

- (UIImage *)croppedImage:(CGRect)bounds;
- (UIImage *)thumbnailImage:(NSInteger)thumbnailSize
          transparentBorder:(NSUInteger)borderSize
               cornerRadius:(NSUInteger)cornerRadius
       interpolationQuality:(CGInterpolationQuality)quality;
- (UIImage *)resizedImage:(CGSize)newSize
     interpolationQuality:(CGInterpolationQuality)quality;
- (UIImage *)resizedImageWithContentMode:(UIViewContentMode)contentMode
                                  bounds:(CGSize)bounds
                    interpolationQuality:(CGInterpolationQuality)quality;