BOMIST is specially targeted for single-users. If you don't need to share your data with anyone else or you are the only person responsible for managing parts and projects in a team, then BOMIST is for you*! It has a FREE and a PRO (paid) version. Free for makers and paid for professionals. A professional is someone who makes money out of electronics. A maker or hobbyist is someone who doesn't. Fair enough, right?
Keep track of your inventory. Know when you have low stock or you ran out of some parts. Adding data is tedious? It shouldn't be. That's why BOMIST has an autocompleter that automatically fills in some relevant data for you: description, value, package name and even datasheets (or other technical documents) it finds on the web. You can also import parts through a CSV file. Easy peasy!