How about using plain files? With files, you have the entire operating system at your disposal to manage them. You can organize them however you see fit with

How about using plain files? With files, you have the entire operating system at your disposal to manage them. You can organize them however you see fit with folders. If you are using links, you can also create additional hierarchies. If you are looking for old ideas, you can use grep or ag (silversurfer) to look for keywords. The operating system keeps track of access times so you can restrict your search to a time frame. If you use git, you have a full history of your versions. With some discipline, e.g. you can use the first paragraph for a summary, you can easily extract content for meta documents like todo or priority lists.