I used to use del.icio.us too, but after their first (?) shutdown I created a few open source projects for my bookmarking needs.
Please, take a look:
https://github.com/usametov/gitmarks -- github-search-friendly format you can export your bookmarks to.
https://github.com/usametov/Bookmarks-ETL -- import/export bookmarks from variety of social bookmarking web sites like del.icio.us, bibsonomy, pinterest. You can export bookmarks to gitmarks as well merge them. I want to add elastic search support in the near future.
https://github.com/usametov/TagSortService -- this is actually bookmark organizer. You can group tags in tag bundles, I personally see a lot reasons for doing that.
All these projects are very young. I am planning to document them properly, dockerize some of them. Please, bear with me.
There is also machine-learning/text-mining work in the pipeline.