5 yrs on, I'm still sorting things out, @Hisredipad.
I've sent some things to DH's kids and I'm in the process of boxing up a small number of family mementoes I found. No idea whether they'll want them.
More than a year after I lost him, I found a box of photo slides from before he knew me. I sent them to his son.
I'd already used some of his socks for swollen feet as dusters, but it took me a time to do that - had to tell myself that I'll buy him more if he comes back and needs them...
This evening, I found a single sock with his hospital name tape on it, from when he spent 4 months in the stroke rehab ward. I used that as a cleaning rag and then put it out. Nuts, I know.
His NHS hearing aid was donated to charity after I checked that the NHS didn't want it back. I've yet to take the one that we bought to the hearing aid shop. (They donate them to Bolivia, apparently.)
We all process these things differently.
There are some things that I can't bear to put out or to pass to his kids yet. I'll leave a note for my executor to tell them where they're to go - for example there's a ledger in which he wrote his repertoire of folk songs.
I'm trying to declutter so I don't leave a mess, but I've already told my cousins to use a house clearance firm though I've told them where to find my jewellery which will no doubt got to Cash for Gold, or similar: I know that my cousins down south sold their mother's jewellery because it wasn't their style.
I've gradually been donating DH's military history books to the charity bookshops in St Andrews. (They won't sell in our town.) I also took his tuxedo there - I could let it go because he never wore that when he was with me: he always wore the kilt when he could. Yes, I still have his kilt[s].
I know that some widows can clear things very quickly. I can't and the widows that I've spoken to have all said that you just take your time and deal with things as you can.
For example, I've held onto a letter written by my MIL to her mother. I couldn't let it go because she mentioned "the wee man"/"baby" - my husband. Now I can, and it's going to his son.
ETA Basically, don't rush yourself. There are a couple of things that I passed on before I was ready and I regret that. Give yourself as much space as you need. Just do a little at a time until you're ready to let go more.