Haxchi v2.5 and CBHC v1.5
Installing just Haxchi is perfectly safe and will give you simple channel access to other homebrew programs without the need of the browser exploit anymore.
Installing CBHC though is FAR, FAR more dangerous but will allow coldboot into patched menu/homebrew, read this for more information:
https://gbatemp.net/threads/452615/
Changes:
when in cbhc/haxchi cfw it will now protect against installing over the used ds vc title