diff --git a/packages/bibfmt/bibfmt.0.7.9/opam b/packages/bibfmt/bibfmt.0.7.9/opam
new file mode 100644
index 000000000000..951be7ca82d5
--- /dev/null
+++ b/packages/bibfmt/bibfmt.0.7.9/opam
@@ -0,0 +1,39 @@
+opam-version: "2.0"
+synopsis: "CLI tools to format and deduplicate bibtex files"
+maintainer: ["marcello.seri@gmail.com"]
+authors: ["Marcello Seri"]
+license: "MIT"
+homepage: "https://github.com/mseri/doi2bib"
+bug-reports: "https://github.com/mseri/doi2bib/issues"
+depends: [
+  "dune" {>= "2.8"}
+  "ocaml" {>= "4.14.0"}
+  "cmdliner" {>= "1.1.0"}
+  "re" {>= "1.0.0"}
+  "odoc" {with-doc}
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "@install"
+#    "@runtest" {with-test}
+    "@doc" {with-doc}
+  ]
+]
+dev-repo: "git+https://github.com/mseri/doi2bib.git"
+x-maintenance-intent: [ "(latest)" ]
+url {
+  src:
+    "https://github.com/mseri/doi2bib/releases/download/0.7.9/doi2bib-0.7.9.tbz"
+  checksum: [
+    "sha256=22c68e7390cedcff3acc87a3638e22dbf6df630a89bcb831bab34b0a22b48fe6"
+    "sha512=7c6c9bab1831112888a3c5c7d10092fe1eb211a3cfb53d5e9712c2b57ac30e48038bdf5fed8c1e12f2b384023f2a69ea1e818b2a8f8822283ed135fbe6c5ba43"
+  ]
+}
+x-commit-hash: "a576b75cb3e01db8d4cc17534a46474742c844b2"
diff --git a/packages/doi2bib/doi2bib.0.7.9/opam b/packages/doi2bib/doi2bib.0.7.9/opam
new file mode 100644
index 000000000000..3a82c9b9d57c
--- /dev/null
+++ b/packages/doi2bib/doi2bib.0.7.9/opam
@@ -0,0 +1,47 @@
+opam-version: "2.0"
+synopsis: "CLI tool to get bibtex entries from DOI/arXiv/PubMed IDs"
+maintainer: ["marcello.seri@gmail.com"]
+authors: ["Marcello Seri"]
+license: "MIT"
+homepage: "https://github.com/mseri/doi2bib"
+bug-reports: "https://github.com/mseri/doi2bib/issues"
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "@install"
+#    "@runtest" {with-test}
+    "@doc" {with-doc}
+  ]
+]
+dev-repo: "git+https://github.com/mseri/doi2bib.git"
+depends: [
+  "dune" {>= "2.8"}
+  "ocaml" {>= "4.08"}
+  "bibfmt" {= version}
+  "astring" {>= "0.8.0"}
+  "cohttp-lwt-unix" {>= "2.5.0"}
+  "cmdliner" {>= "1.1.0"}
+  "clz" {>= "0.1.0"}
+  "ezxmlm" {>= "1.1.0"}
+  "lwt" {>= "5.5.0"}
+  "bigstringaf" {>= "0.2.0"}
+  ("tls" {>= "0.12.0" & < "0.16"} | "tls-lwt")
+  "re" {>= "1.0.0"}
+  "odoc" {with-doc}
+]
+x-maintenance-intent: [ "(latest)" ]
+url {
+  src:
+    "https://github.com/mseri/doi2bib/releases/download/0.7.9/doi2bib-0.7.9.tbz"
+  checksum: [
+    "sha256=22c68e7390cedcff3acc87a3638e22dbf6df630a89bcb831bab34b0a22b48fe6"
+    "sha512=7c6c9bab1831112888a3c5c7d10092fe1eb211a3cfb53d5e9712c2b57ac30e48038bdf5fed8c1e12f2b384023f2a69ea1e818b2a8f8822283ed135fbe6c5ba43"
+  ]
+}
+x-commit-hash: "a576b75cb3e01db8d4cc17534a46474742c844b2"