Sorry I missed this message. As @intelligentDesign explained so well. Heartbleed do not directly affect plugins unless they were meant to use some kind of cyphering techniques using OpenSSL.
However, using plugins may put at risk your WordPress installations, that's why we should check plugins' reviews and ratings before downloading something.
I as a plugin developer do my best to provide a clean and secure-enough code, however we are human and we could make a mistake which can put at risk users' websites. That's why I encourage people to review my code and provide feedback so I can confirm everything is working as expected.
Free software developers in my opinion should have a very public profile so people can check who they are, what have they done and if they have a good reputation. I provide my real name as well as links to other things I've done so people can check my background and decide if they trust me enough to install something I've made or not.